diff --git a/src/main/java/pers/xanadu/enderdragon/EnderDragon.java b/src/main/java/pers/xanadu/enderdragon/EnderDragon.java
index 6835535..f975a23 100644
--- a/src/main/java/pers/xanadu/enderdragon/EnderDragon.java
+++ b/src/main/java/pers/xanadu/enderdragon/EnderDragon.java
@@ -106,7 +106,6 @@ public final class EnderDragon extends JavaPlugin {
         finish = true;
     }
     public static void reloadAll(){
-        ItemManager.getLegacy().set(false);
         WorldManager.reload();
         GlowManager.reload();
         EnderDragon.getInstance().loadFiles();
@@ -129,11 +128,6 @@ public final class EnderDragon extends JavaPlugin {
                 this.cancel();
                 DragonManager.reload();
                 GuiManager.loadGui();
-                if (ItemManager.getLegacy().get()){
-                    Lang.error("I'm sorry that data_type 'nbt' and 'advanced' probably will be disabled in 1.20.5+");
-                    Lang.error("It is recommended to migrate item configuration to bukkit format for compatibility.");
-                    Lang.error("You can use /ed migrate to generate new config.");
-                }
 
                 runnable.runTaskTimer(plugin,0,1);
             }
diff --git a/src/main/java/pers/xanadu/enderdragon/command/MainCommand.java b/src/main/java/pers/xanadu/enderdragon/command/MainCommand.java
index 3476d6b..7605dc1 100644
--- a/src/main/java/pers/xanadu/enderdragon/command/MainCommand.java
+++ b/src/main/java/pers/xanadu/enderdragon/command/MainCommand.java
@@ -36,11 +36,6 @@ public class MainCommand implements CommandExecutor {
                 else if(args.length == 3) GroovyManager.invoke("test.groovy",args[1],args[2]);
                 return true;
             }
-            case "migrate" : {
-                if (!sender.isOp()) return false;
-                FileUpdater.migrate();
-                return true;
-            }
 //            case "worlds" : {
 //                if(!sender.isOp()){
 //                    Lang.sendFeedback(sender,Lang.command_no_permission);
diff --git a/src/main/java/pers/xanadu/enderdragon/config/FileUpdater.java b/src/main/java/pers/xanadu/enderdragon/config/FileUpdater.java
index ca85c37..c76d38b 100644
--- a/src/main/java/pers/xanadu/enderdragon/config/FileUpdater.java
+++ b/src/main/java/pers/xanadu/enderdragon/config/FileUpdater.java
@@ -1,267 +1,10 @@
 package pers.xanadu.enderdragon.config;
 
-import org.bukkit.Bukkit;
-import org.bukkit.configuration.ConfigurationSection;
-import org.bukkit.configuration.InvalidConfigurationException;
-import org.bukkit.configuration.file.FileConfiguration;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.bukkit.enchantments.Enchantment;
-import org.bukkit.inventory.ItemFlag;
-import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.meta.ItemMeta;
-import org.bukkit.inventory.meta.Repairable;
-import org.bukkit.persistence.PersistentDataContainer;
-import pers.xanadu.enderdragon.EnderDragon;
-import pers.xanadu.enderdragon.manager.ItemManager;
-import pers.xanadu.enderdragon.manager.TaskManager;
-import pers.xanadu.enderdragon.reward.Chance;
-import pers.xanadu.enderdragon.reward.Reward;
-import pers.xanadu.enderdragon.util.Version;
-
 import java.io.*;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import static pers.xanadu.enderdragon.EnderDragon.*;
 
 public class FileUpdater {
     public static void update() throws IOException {
-        Lang.warn("Nothing to update. Maybe you need '/ed migrate'?");
-//        FileConfiguration config_old = plugin.getConfig();
-//        boolean chinese = "Chinese".equals(config_old.getString("lang"));
-//        File folder = new File(plugin.getDataFolder(),"setting");
-//        if(folder.exists()){
-//            File[] files = folder.listFiles();
-//            if(files != null){
-//                for(File file : files){
-//                    FileConfiguration config = YamlConfiguration.loadConfiguration(file);
-//                    String ver = config.getString("version");
-//                    if(!"2.2.0".equals(ver)) {
-//                        Lang.error("The version of setting/"+file.getName()+" is not supported!");
-//                        continue;
-//                    }
-//                    String name = file.getName();
-//                    Config.copyFile("setting/"+name,"new/setting/"+name,true);
-//                }
-//                File new_folder = new File(plugin.getDataFolder(),"new/setting/");
-//                files = new_folder.listFiles();
-//                if(files != null){
-//                    for(File file : files){
-//                        FileOutputStream out = new FileOutputStream(file,true);
-//                        if (chinese){
-//                            out.write(("\n\n" +
-//                                    "# 一些特殊的战利品\n" +
-//                                    "special_loot:\n" +
-//                                    "  # 你可以按格式添加更多条目，但是名称不能重复\n" +
-//                                    "  # 如果找不到执行目标(target)，所在战利品条目会被忽略\n" +
-//                                    "  # 目前支持的type: exp(经验), command(执行指令，可解析伤害排名)\n" +
-//                                    "  loot1:\n" +
-//                                    "    # [true/false]\n" +
-//                                    "    enable: false\n" +
-//                                    "    type: command\n" +
-//                                    "    # %attacker% -> 所有参与屠龙的玩家\n" +
-//                                    "    target: \"%attacker%\"\n" +
-//                                    "    # %player% -> 目标, %damage% -> 该玩家造成的总伤害\n" +
-//                                    "    data:\n" +
-//                                    "      - 'give %player% stone 1'\n" +
-//                                    "      - 'ed action %player% tell: 你获得了保底奖励.'\n" +
-//                                    "  loot2:\n" +
-//                                    "    enable: false\n" +
-//                                    "    type: command\n" +
-//                                    "    # %attacker_top_<rank>% -> 在屠龙中取得此排名的玩家\n" +
-//                                    "    target: \"%attacker_top_1%\"\n" +
-//                                    "    data:\n" +
-//                                    "      - 'ed action %player% tell: 你的伤害占比是最高的!'\n" +
-//                                    "      - 'ed action %player% tell: 你造成的伤害: %damage%'\n" +
-//                                    "  loot_exp1:\n" +
-//                                    "    enable: false\n" +
-//                                    "    type: exp\n" +
-//                                    "    target: \"%attacker_top_2%\"\n" +
-//                                    "    data:\n" +
-//                                    "      # 给予排名第二的玩家20点经验\n" +
-//                                    "      amount: 20\n" +
-//                                    "\n\n"
-//                            ).getBytes());
-//                        }
-//                        else{
-//                            out.write(("\n\n" +
-//                                    "special_loot:\n" +
-//                                    "  # You can add more entries with DIFFERENT name according to the format.\n" +
-//                                    "  # If such target not exists, this option will be ignored.\n" +
-//                                    "  # type: exp, command\n" +
-//                                    "  loot1:\n" +
-//                                    "    # [true/false]\n" +
-//                                    "    enable: false\n" +
-//                                    "    type: command\n" +
-//                                    "    # %attacker% -> all participants in dragon slaying\n" +
-//                                    "    target: \"%attacker%\"\n" +
-//                                    "    # %player% -> target, %damage% -> this player's damage to EnderDragon\n" +
-//                                    "    data:\n" +
-//                                    "      - 'give %player% stone 1'\n" +
-//                                    "      - 'ed action %player% tell: This is a guaranteed reward.'\n" +
-//                                    "  loot2:\n" +
-//                                    "    enable: false\n" +
-//                                    "    type: command\n" +
-//                                    "    # %attacker_top_<rank>% -> the player with exactly this rank\n" +
-//                                    "    target: \"%attacker_top_1%\"\n" +
-//                                    "    data:\n" +
-//                                    "      - 'ed action %player% tell: You are the one who causes the highest damage!'\n" +
-//                                    "      - 'ed action %player% tell: Your damage: %damage%'\n" +
-//                                    "  loot_exp1:\n" +
-//                                    "    enable: false\n" +
-//                                    "    type: exp\n" +
-//                                    "    target: \"%attacker_top_2%\"\n" +
-//                                    "    data:\n" +
-//                                    "      # add 20 exp for the rank_2 player\n" +
-//                                    "      amount: 20\n" +
-//                                    "\n\n"
-//                            ).getBytes());
-//                        }
-//                        out.close();
-//                        FileConfiguration fc = YamlConfiguration.loadConfiguration(file);
-//                        fc.set("version","2.4.0");
-//                        fc.save(file);
-//                    }
-//                }
-//            }
-//        }
-//        Lang.info("New config files are generated in plugins/EnderDragon/new.");
-//        Lang.warn("Attention: Please confirm the accuracy before using new config!");
-    }
-    public static void migrate(){
-        boolean b1 = handleRewards();
-        boolean b2 = handleGuiItems();
-        if (b1 || b2) Lang.info("New reward configuration files are generated in plugins/EnderDragon/migrate.");
-        else Lang.warn("No files need to be migrated!");
-    }
-    private static boolean handleGuiItems(){
-        File folder = new File(plugin.getDataFolder(),"gui");
-        if (!folder.exists()) return false;
-        File[] files = folder.listFiles(f -> f.getName().endsWith(".yml"));
-        if (files == null || files.length == 0) {
-            return false;
-        }
-        for (File file : files){
-            Config.copyFile(file,"new/gui/"+file.getName(),true);
-            File gen_file = new File(plugin.getDataFolder(),"new/gui/"+file.getName());
-            YamlConfiguration cfg = YamlConfiguration.loadConfiguration(gen_file);
-            cfg.getKeys(false).forEach(key->{
-                ConfigurationSection gui = cfg.getConfigurationSection(key);
-                if (gui == null) return;
-                ConfigurationSection Items = gui.getConfigurationSection("Items");
-                if (Items == null) return;
-                Items.getKeys(false).forEach(ch -> {
-                    ConfigurationSection slot = Items.getConfigurationSection(ch);
-                    if (slot == null) return;
-                    if (!slot.contains("data")) return;
-                    ItemStack itemStack = readItemStack(slot,"data");
-                    ItemManager.save2section_simple(itemStack,slot,"data");
-                    if (!slot.contains("data_disable")) return;
-                    itemStack = readItemStack(slot,"data_disable");
-                    ItemManager.save2section_simple(itemStack,slot,"data_disable");
-                });
-                Items.getKeys(false).forEach(ch -> {
-                    ConfigurationSection slot = Items.getConfigurationSection(ch);
-                    if (slot == null) return;
-                    if (slot.contains("data_type")){
-                        slot.set("data_type","simple");
-                    }
-                    else if (slot.contains("data") || slot.contains("data_disable")) {
-                        slot.set("data_type","simple");
-                    }
-                });
-            });
-            try{
-                cfg.save(gen_file);
-            }catch (IOException e){
-                e.printStackTrace();
-            }
-        }
-        return true;
-    }
-    private static ItemStack readItemStack(ConfigurationSection section,final String path){
-        ItemStack itemStack;
-        final String type = section.getString("data_type","");
-        switch (type){
-            case "nbt":
-                itemStack = ItemManager.readFromNBT(section,path);
-                ItemManager.getLegacy().compareAndSet(false,true);
-                break;
-            case "advanced":
-                itemStack = ItemManager.readFromAdvData(section,path);
-                ItemManager.getLegacy().compareAndSet(false,true);
-                break;
-            case "simple":
-                itemStack = ItemManager.readFromSimple(section,path);
-                break;
-            default:
-                itemStack = ItemManager.readFromBukkit(section,path);
-        }
-        return itemStack;
-    }
-    private static boolean handleRewards(){
-        File folder = new File(plugin.getDataFolder(),"reward");
-        if (!folder.exists()) return false;
-        File[] files = folder.listFiles(f -> f.getName().endsWith(".yml"));
-        if (files == null || files.length == 0) {
-            return false;
-        }
-        for (File file : files){
-            FileConfiguration config = YamlConfiguration.loadConfiguration(file);
-            Config.copyFile(file,"new/reward/"+file.getName(),true);
-            File gen_file = new File(plugin.getDataFolder(),"new/reward/"+file.getName());
-            YamlConfiguration new_cfg = YamlConfiguration.loadConfiguration(gen_file);
-            if(Config.advanced_setting_backslash_split_reward) new_cfg.options().pathSeparator('\\');
-            List<String> gen = new ArrayList<>();
-            List<String> list = config.getStringList("list");
-            for(String str : list){
-                YamlConfiguration yml = new YamlConfiguration();
-                if(Config.advanced_setting_backslash_split_reward) yml.options().pathSeparator('\\');
-                try{
-                    yml.loadFromString(str);
-                    Reward reward = ItemManager.readAsReward(yml);
-                    if (reward == null) continue;
-                    gen.add(saveReward(reward));
-                }catch (InvalidConfigurationException e){
-                    Lang.error(Lang.plugin_item_read_error + str);
-                }
-            }
-            new_cfg.set("list",gen);
-            try{
-                new_cfg.save(gen_file);
-            }catch (IOException e){
-                e.printStackTrace();
-            }
-        }
-        return true;
-    }
-    private static String saveReward(Reward reward){
-        Chance chance = reward.getChance();
-        ItemStack item = reward.getItem();
-        double value = chance.getValue();
-        String str = chance.getStr();
-        String name = reward.getName();
-        YamlConfiguration yaml = new YamlConfiguration();
-        if(Config.advanced_setting_backslash_split_reward) yaml.options().pathSeparator('\\');
-        if(name == null){
-            ItemMeta meta = item.getItemMeta();
-            if(meta != null) {
-                String displayName = meta.getDisplayName();
-                if("".equals(displayName) || displayName == null){
-                    name = item.getType().name().toLowerCase() + "(" + TaskManager.getCurrentTimeWithSpecialFormat() + ")";
-                }
-                else name = meta.getDisplayName();
-            }
-            else name = item.getType().name().toLowerCase() + "(" + TaskManager.getCurrentTimeWithSpecialFormat() + ")";
-        }
-        ConfigurationSection section = yaml.createSection(name);
-        section.set("data_type", "default");
-        section.set("data", item);
-        ConfigurationSection drop_section = section.createSection("drop_chance");
-        drop_section.set("value",value);
-        drop_section.set("format",str);
-        return yaml.saveToString();
+        Lang.warn("Nothing to update.");
     }
+
 }
diff --git a/src/main/java/pers/xanadu/enderdragon/gui/GUI.java b/src/main/java/pers/xanadu/enderdragon/gui/GUI.java
index 53ba05b..fbab058 100644
--- a/src/main/java/pers/xanadu/enderdragon/gui/GUI.java
+++ b/src/main/java/pers/xanadu/enderdragon/gui/GUI.java
@@ -118,7 +118,7 @@ public class GUI {
             resetPagedItem(key,cmd);
         }
         else if(type == 2){
-            for(MyDragon myDragon : DragonManager.get_dragons()){
+            for(MyDragon myDragon : DragonManager.getDragons()){
                 this.addDragon(myDragon.icon.clone(),myDragon.unique_name);
             }
         }
diff --git a/src/main/java/pers/xanadu/enderdragon/gui/slot/TipSlot.java b/src/main/java/pers/xanadu/enderdragon/gui/slot/TipSlot.java
index cdab178..40a1672 100644
--- a/src/main/java/pers/xanadu/enderdragon/gui/slot/TipSlot.java
+++ b/src/main/java/pers/xanadu/enderdragon/gui/slot/TipSlot.java
@@ -6,7 +6,6 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import pers.xanadu.enderdragon.gui.GUISlot;
 import pers.xanadu.enderdragon.gui.GUISlotType;
-import pers.xanadu.enderdragon.manager.ItemManager;
 
 import static pers.xanadu.enderdragon.manager.ItemManager.*;
 
@@ -33,12 +32,10 @@ public class TipSlot extends GUISlot {
         this.data_type = DataType.fromString(section.getString("data_type"));
         switch (data_type) {
             case NBT:
-                ItemManager.getLegacy().compareAndSet(false,true);
                 this.item = readFromNBT(section,"data");
                 if(hasDisableMode) this.itemOnDisable = readFromNBT(section,"data_disable");
                 break;
             case ADVANCED:
-                ItemManager.getLegacy().compareAndSet(false,true);
                 this.item = readFromAdvData(section,"data");
                 if(hasDisableMode) this.itemOnDisable = readFromAdvData(section,"data_disable");
                 break;
diff --git a/src/main/java/pers/xanadu/enderdragon/manager/DragonManager.java b/src/main/java/pers/xanadu/enderdragon/manager/DragonManager.java
index 92a3f56..0e9c664 100644
--- a/src/main/java/pers/xanadu/enderdragon/manager/DragonManager.java
+++ b/src/main/java/pers/xanadu/enderdragon/manager/DragonManager.java
@@ -1,5 +1,6 @@
 package pers.xanadu.enderdragon.manager;
 
+import lombok.Getter;
 import org.bukkit.*;
 import org.bukkit.attribute.Attribute;
 import org.bukkit.attribute.AttributeInstance;
@@ -12,7 +13,6 @@ import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.entity.*;
 import org.bukkit.potion.PotionEffect;
 import org.bukkit.potion.PotionEffectType;
-import org.bukkit.scheduler.BukkitRunnable;
 import org.jetbrains.annotations.Nullable;
 import pers.xanadu.enderdragon.config.Config;
 import pers.xanadu.enderdragon.config.Lang;
@@ -35,7 +35,11 @@ import java.util.regex.Pattern;
 import static pers.xanadu.enderdragon.EnderDragon.*;
 
 public class DragonManager {
-    static final ArrayList<MyDragon> dragons = new ArrayList<>();
+    /**
+     * 底层是unmodifiableList
+     */
+    @Getter
+    static List<MyDragon> dragons;
     static final Map<String, MyDragon> mp = new HashMap<>();
     public static List<String> dragon_names = new ArrayList<>();
     public static final Map<UUID,DragonInfo> existing_dragon = new ConcurrentHashMap<>();
@@ -54,7 +58,7 @@ public class DragonManager {
     private static final Pattern pattern_attacker_top = Pattern.compile("%attacker_top_(\\d+)%");
 
     public static void reload(){
-        dragons.clear();
+        final List<MyDragon> dragons = new ArrayList<>();
         mp.clear();
         dragon_names.clear();
         sum = 0;
@@ -94,9 +98,10 @@ public class DragonManager {
             if(!Version.setting_dragon.equals(fc.getString("version"))){
                 Lang.warn(Lang.plugin_wrong_file_version.replace("{file_name}", file.getName()));
             }
-            readSettingFile(fc,edge);
+            readSettingFile(fc,edge,dragons);
         }
         dragons.sort((o1, o2) -> o2.priority - o1.priority);
+        DragonManager.dragons = Collections.unmodifiableList(dragons);
         RewardManager.reload();
     }
     public static MyDragon judge(){
@@ -119,16 +124,11 @@ public class DragonManager {
             }
             return cur;
         }
-        else if(Config.special_dragon_jude_mode.equalsIgnoreCase("edge")){
-            int cnt = 0, random = ThreadLocalRandom.current().nextInt(0, sum);
-            for(MyDragon cur : dragons){
-                if(cnt <= random && cnt + cur.edge > random){
-                    return cur;
-                }
-                cnt += cur.edge;
-            }
-            Lang.error("\"edge\" in \"special_dragon_jude_mode\" of config.yml is deprecated!Please use \"weight\" instead.");
+        else{
+            Lang.error("Unknown 'special_dragon_jude_mode' of config.yml.");
+            Lang.error("Possible solutions: pc, weight(named 'edge' in old versions).");
         }
+        //unreachable
         return null;
     }
     public static void setSpecialKey(Entity e, String key){
@@ -140,7 +140,7 @@ public class DragonManager {
         }
         return null;
     }
-    public static void readSettingFile(FileConfiguration f,int edge){
+    public static void readSettingFile(FileConfiguration f,int edge,List<MyDragon> dragons){
         MyDragon myDragon = new MyDragon();
         myDragon.unique_name = f.getString("unique_name","default");
         if(mp.containsKey(myDragon.unique_name)){
@@ -330,7 +330,7 @@ public class DragonManager {
         }
     }
     public static void disable(){
-        dragons.clear();
+        dragons = null;
         mp.clear();
         dragon_names.clear();
     }
@@ -345,13 +345,6 @@ public class DragonManager {
         return mp.get(unique_name);
     }
 
-    /**
-     * 请勿修改得到的List
-     */
-    @Deprecated
-    public static List<MyDragon> get_dragons(){
-        return dragons;
-    }
     @Nullable
     public static MyDragon getFromInfo(DragonInfo info){
         return mp.get(info.unique_name);
@@ -486,7 +479,7 @@ public class DragonManager {
     /**
      * Only used to initialize. DON'T use this if speed is essential.
      * @param world world
-     * @return The dragon found in this world.
+     * @return The dragon found in this world, or null if not found.
      */
     public static EnderDragon getEnderDragon(final World world){
         if(world.getEnvironment() != World.Environment.THE_END){
diff --git a/src/main/java/pers/xanadu/enderdragon/manager/GroovyManager.java b/src/main/java/pers/xanadu/enderdragon/manager/GroovyManager.java
index f21163e..2687b11 100644
--- a/src/main/java/pers/xanadu/enderdragon/manager/GroovyManager.java
+++ b/src/main/java/pers/xanadu/enderdragon/manager/GroovyManager.java
@@ -6,6 +6,7 @@ import io.netty.util.internal.ConcurrentSet;
 import org.bukkit.entity.Player;
 import org.codehaus.groovy.control.CompilerConfiguration;
 import org.codehaus.groovy.control.customizers.ImportCustomizer;
+import pers.xanadu.enderdragon.EnderDragon;
 import pers.xanadu.enderdragon.config.Config;
 import pers.xanadu.enderdragon.script.Events;
 import pers.xanadu.enderdragon.script.tool.ScriptCommand;
@@ -39,7 +40,7 @@ public class GroovyManager {
             importCustomizer.addImport("Command","pers.xanadu.enderdragon.script.tool.ScriptCommand");
             importCustomizer.addStaticImport("plugin","pers.xanadu.enderdragon.EnderDragon","plugin");
             compilerConfig.addCompilationCustomizers(importCustomizer);
-            GroovyClassLoader classLoader = new GroovyClassLoader(GroovyManager.class.getClassLoader(),compilerConfig);
+            GroovyClassLoader classLoader = new GroovyClassLoader(EnderDragon.class.getClassLoader(),compilerConfig);
             engine = new GroovyScriptEngine(new URL[]{baseDir.toURI().toURL()}, classLoader);
             InputStream inputStream = plugin.getResource("script/lib.groovy");
             lib = Config.convertInputStreamToString(inputStream);
diff --git a/src/main/java/pers/xanadu/enderdragon/manager/ItemManager.java b/src/main/java/pers/xanadu/enderdragon/manager/ItemManager.java
index e49325f..7d4be12 100644
--- a/src/main/java/pers/xanadu/enderdragon/manager/ItemManager.java
+++ b/src/main/java/pers/xanadu/enderdragon/manager/ItemManager.java
@@ -1,6 +1,5 @@
 package pers.xanadu.enderdragon.manager;
 
-import lombok.Getter;
 import org.bukkit.Material;
 import org.bukkit.attribute.Attribute;
 import org.bukkit.attribute.AttributeModifier;
@@ -20,11 +19,8 @@ import pers.xanadu.enderdragon.reward.Chance;
 import pers.xanadu.enderdragon.util.Version;
 
 import java.util.*;
-import java.util.concurrent.atomic.AtomicBoolean;
 
 public class ItemManager {
-    @Getter
-    private static final AtomicBoolean legacy = new AtomicBoolean(false);
     public static String write(Reward reward){
         Chance chance = reward.getChance();
         return write(reward.getItem(),chance.getValue(),chance.getStr(),reward.getName());
@@ -84,11 +80,9 @@ public class ItemManager {
         //data_type may be null
         ItemStack item;
         if("nbt".equals(data_type)) {
-            legacy.compareAndSet(false,true);
             item = readFromNBT(section0,"data");
         }
         else if("advanced".equals(data_type)) {
-            legacy.compareAndSet(false,true);
             item = readFromAdvData(section0, "data");
         }
         else {
@@ -101,6 +95,13 @@ public class ItemManager {
         return new Reward(item,new Chance(d0, str));
     }
     public static ItemStack readFromAdvData(ConfigurationSection section, String path){
+        if (Version.isNBT_UPDATE()){
+            throw new UnsupportedOperationException(
+                    "I'm sorry that data_type 'nbt' and 'advanced' have been temporarily disabled since 1.20.5.\n"+
+                    "You can migrate configurations through '/ed migrate' EnderDragon v2.5.1.\n"+
+                    "I will reconstruct this plugin add restore this function in the future."
+            );
+        }
         ConfigurationSection data = section.getConfigurationSection(path);
         if(data == null) return new ItemStack(Material.AIR);
         String type = data.getString("type");
@@ -221,6 +222,13 @@ public class ItemManager {
         return item;
     }
     public static ItemStack readFromNBT(ConfigurationSection section, String path){
+        if (Version.isNBT_UPDATE()){
+            throw new UnsupportedOperationException(
+                    "I'm sorry that data_type 'nbt' and 'advanced' have been temporarily disabled since 1.20.5.\n"+
+                    "You can migrate configurations through '/ed migrate' EnderDragon v2.5.1.\n"+
+                    "I will reconstruct this plugin add restore this function in the future."
+            );
+        }
         String nbt = section.getString(path);
         if (nbt == null) return new ItemStack(Material.AIR);
         return EnderDragon.getInstance().getNMSItemManager().readAsItem(nbt);
diff --git a/src/main/java/pers/xanadu/enderdragon/util/NMSUtil.java b/src/main/java/pers/xanadu/enderdragon/util/NMSUtil.java
index 27f1744..b719716 100644
--- a/src/main/java/pers/xanadu/enderdragon/util/NMSUtil.java
+++ b/src/main/java/pers/xanadu/enderdragon/util/NMSUtil.java
@@ -1,5 +1,6 @@
 package pers.xanadu.enderdragon.util;
 
+import lombok.Getter;
 import org.bukkit.Bukkit;
 import org.bukkit.World;
 import org.bukkit.inventory.ItemStack;
@@ -14,19 +15,20 @@ import java.util.Map;
 public class NMSUtil {
     private Method getNMSWord;
     private Method asNMSCopy;
-    private Method copyNMSStack;
     private Method asBukkitCopy;
-    private Method asCraftMirror;
     /**
      * 浅拷贝unhandledTags
      */
     private Method asCraftCopy;
+    @Deprecated
     private Method NMSItemStack_save;
+    @Deprecated
     private Method cpdToEi;
     private Method stringToCPD;
-    private Method stringToNBTBase;
     private Method PDCtoCPD;
+    @Deprecated
     private Method PersistentDataContainer_putAll;
+    @Deprecated
     private Method NBTTagCompound_set;
     private Field unhandledTags;
     private Field world_c_environment;
@@ -35,11 +37,14 @@ public class NMSUtil {
     private Class<?> CraftWorldClass;
     private Class<?> WorldProviderClass;
     private Class<?> CraftItemStackClass;
+    @Getter
     private Class<?> CraftMetaItemClass;
+    @Getter
     private Class<?> NMSItemStackClass;
     private Class<?> CraftEntityClass;
     private Class<?> NBTTagCompoundClass;
     private Class<?> NBTBaseClass;
+    @Getter
     private Class<?> MojangsonParserClass;
     private Class<?> CraftPersistentDataContainerClass;
 
@@ -63,26 +68,30 @@ public class NMSUtil {
             this.CraftEntityClass = Class.forName("org.bukkit.craftbukkit."+version+".entity.CraftEntity");
             init_NBTTagCompoundClass();
             init_NBTBaseClass();
-            init_NBTTagCompound_map();
-            this.NBTTagCompound_set = NBTTagCompoundClass.getMethod(getMethodName(ReflectiveMethod.NBTTagCompound_set),String.class,NBTBaseClass);
+            if (!Version.isNBT_UPDATE()){
+                init_NBTTagCompound_map();
+                this.NBTTagCompound_set = NBTTagCompoundClass.getMethod(getMethodName(ReflectiveMethod.NBTTagCompound_set),String.class,NBTBaseClass);
+            }
             this.asNMSCopy = CraftItemStackClass.getMethod("asNMSCopy",ItemStack.class);
-            this.copyNMSStack = CraftItemStackClass.getMethod("copyNMSStack",NMSItemStackClass,int.class);
             this.asBukkitCopy = CraftItemStackClass.getMethod("asBukkitCopy",NMSItemStackClass);
-            this.asCraftMirror = CraftItemStackClass.getMethod("asCraftMirror",NMSItemStackClass);
             this.asCraftCopy = CraftItemStackClass.getMethod("asCraftCopy",ItemStack.class);
-            this.NMSItemStack_save = NMSItemStackClass.getMethod(getMethodName(ReflectiveMethod.NMSItemStack_save),NBTTagCompoundClass);
-            if(Version.mcMainVersion>=13) this.cpdToEi = NMSItemStackClass.getMethod("a",NBTTagCompoundClass);
+
+            if (!Version.isNBT_UPDATE()){
+                this.NMSItemStack_save = NMSItemStackClass.getMethod(getMethodName(ReflectiveMethod.NMSItemStack_save),NBTTagCompoundClass);
+                if(Version.mcMainVersion>=13) this.cpdToEi = NMSItemStackClass.getMethod("a",NBTTagCompoundClass);
+            }
+
 
             if(Version.mcMainVersion<=16) this.MojangsonParserClass = Class.forName("net.minecraft.server."+version+".MojangsonParser");
             else this.MojangsonParserClass = Class.forName("net.minecraft.nbt.MojangsonParser");
             this.stringToCPD = MojangsonParserClass.getMethod(getMethodName(ReflectiveMethod.MojangsonParser_parse),String.class);
-            this.stringToNBTBase = MojangsonParserClass.getDeclaredMethod(getMethodName(ReflectiveMethod.MojangsonParser_parseLiteral),String.class);
-            stringToNBTBase.setAccessible(true);
 
             if(Version.mcMainVersion>=14){
                 this.CraftPersistentDataContainerClass = Class.forName("org.bukkit.craftbukkit." + version + ".persistence.CraftPersistentDataContainer");
                 this.PDCtoCPD = CraftPersistentDataContainerClass.getDeclaredMethod("toTagCompound");
-                this.PersistentDataContainer_putAll = CraftPersistentDataContainerClass.getDeclaredMethod("putAll",NBTTagCompoundClass);
+                if (!Version.isNBT_UPDATE()){
+                    this.PersistentDataContainer_putAll = CraftPersistentDataContainerClass.getDeclaredMethod("putAll",NBTTagCompoundClass);
+                }
             }
 
 
@@ -115,6 +124,7 @@ public class NMSUtil {
         Object new_cpd = getNBTTagCompound(self);
         return EnderDragon.getInstance().getNMSItemManager().cpdToItem(new_cpd);
     }
+    @SuppressWarnings("unchecked")
     public Map<String,Object> cpdToMap(final Object cpd){
         try{
             return (Map<String, Object>) NBTTagCompound_map.get(cpd);
@@ -123,6 +133,8 @@ public class NMSUtil {
             return null;
         }
     }
+    @SuppressWarnings({"unchecked"})
+    @Deprecated
     public Object getNBTTagCompound(final Map<String,Object> mp){
         try{
             Object cpd = NBTTagCompoundClass.newInstance();
@@ -144,6 +156,7 @@ public class NMSUtil {
             return null;
         }
     }
+    @Deprecated
     public void setPersistentDataContainer(final PersistentDataContainer dataContainer,final Object cpd){
         try{
             Object PDC = CraftPersistentDataContainerClass.cast(dataContainer);
@@ -162,6 +175,7 @@ public class NMSUtil {
         }
     }
 
+    @Deprecated
     public String getNBT(final ItemStack item){
         try{
             Object ci = CraftItemStackClass.isInstance(item)?CraftItemStackClass.cast(item):asCraftCopy.invoke(null,item);//浅拷贝unhandledTags
@@ -173,6 +187,7 @@ public class NMSUtil {
             return "{id:\"minecraft:air\"}";
         }
     }
+    @Deprecated
     public Object getCPD(final ItemStack item){
         try{
             Object ci = CraftItemStackClass.isInstance(item)?CraftItemStackClass.cast(item):asCraftCopy.invoke(null,item);//浅拷贝unhandledTags
@@ -194,6 +209,7 @@ public class NMSUtil {
     /**
      *  仅1.13+可用
      */
+    @Deprecated
     public ItemStack getItemStack(final Object cpd){
         try{
             Object ei = cpdToEi.invoke(null,cpd);
@@ -207,6 +223,7 @@ public class NMSUtil {
     /**
      *  仅1.13+可用
      */
+    @Deprecated
     public ItemStack getItemStack(final String nbt){
         try{
             Object cpd = stringToCPD.invoke(null,nbt);
@@ -241,6 +258,7 @@ public class NMSUtil {
         if (this.CraftWorldClass.isInstance(ThisWorld)) return this.CraftWorldClass.cast(ThisWorld);
         return null;
     }
+    @SuppressWarnings("unused")
     public Object getWorld_e(final World world){
         try {
             Object world_c = getCraftWorld(world);
@@ -250,12 +268,6 @@ public class NMSUtil {
         }
         return null;
     }
-    public Class<?> getNBTBaseClass(){
-        return this.NBTBaseClass;
-    }
-    public Class<?> getNBTTagCompoundClass(){
-        return this.NBTTagCompoundClass;
-    }
     public Class<?> getWorldClass(){
         return this.WorldClass;
     }
@@ -320,7 +332,7 @@ public class NMSUtil {
             e.printStackTrace();
         }
     }
-    private static enum ReflectiveMethod {
+    private enum ReflectiveMethod {
         NMSItemStack_save,
         NMSItemStack_setTag,
         MojangsonParser_parse,
diff --git a/src/main/java/pers/xanadu/enderdragon/util/Version.java b/src/main/java/pers/xanadu/enderdragon/util/Version.java
index 99b7493..51be43b 100644
--- a/src/main/java/pers/xanadu/enderdragon/util/Version.java
+++ b/src/main/java/pers/xanadu/enderdragon/util/Version.java
@@ -1,5 +1,6 @@
 package pers.xanadu.enderdragon.util;
 
+import lombok.Getter;
 import pers.xanadu.enderdragon.config.Lang;
 import pers.xanadu.enderdragon.nms.BossBar.IBossBarManager;
 import pers.xanadu.enderdragon.nms.NMSItem.INMSItemManager;
@@ -16,6 +17,8 @@ public class Version {
     public static final String reward = "2.1.0";
     public static int mcMainVersion;
     public static int mcPatchVersion;
+    @Getter
+    public static boolean NBT_UPDATE;
     private static String version = "no version found";
     private static boolean isMohist = false;
     public static void init(){
@@ -34,7 +37,7 @@ public class Version {
             Class.forName("net.minecraftforge.server.ServerMain");
             isMohist = true;
         }catch(ReflectiveOperationException ignored){}
-
+        NBT_UPDATE = mcMainVersion > 20 || mcMainVersion == 20 && mcPatchVersion >=5;
     }
     public static INMSItemManager getNMSItemManager(){
         switch (version){
diff --git a/src/main/resources/config-zhcn.yml b/src/main/resources/config-zhcn.yml
index e57f4b9..c3510d5 100644
--- a/src/main/resources/config-zhcn.yml
+++ b/src/main/resources/config-zhcn.yml
@@ -74,7 +74,7 @@ blacklist_worlds:
 #写法示例: [COMMAND,CUSTOM]
 blacklist_spawn_reason: []
 
-#可选: [default/nbt/advanced]
+#可选: [default/nbt(<=1.20.4)/advanced(<=1.20.4)]
 item_format:
   reward: default
 
diff --git a/src/main/resources/config.yml b/src/main/resources/config.yml
index 502a245..82e4dce 100644
--- a/src/main/resources/config.yml
+++ b/src/main/resources/config.yml
@@ -73,7 +73,7 @@ blacklist_worlds:
 # example: [COMMAND,CUSTOM]
 blacklist_spawn_reason: []
 
-#optional: [default/nbt/advanced]
+#optional: [default/nbt(<=1.20.4)/advanced(<=1.20.4)]
 item_format:
   reward: default
 
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index 4c58e42..5e18044 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -1,5 +1,5 @@
 name: EnderDragon
-version: 2.5.1
+version: 2.5.2
 main: pers.xanadu.enderdragon.EnderDragon
 author: Xanadu13
 api-version: 1.13