diff --git a/src/main/java/com/garbagemule/MobArena/ArenaImpl.java b/src/main/java/com/garbagemule/MobArena/ArenaImpl.java
index 006e274..853a067 100644
--- a/src/main/java/com/garbagemule/MobArena/ArenaImpl.java
+++ b/src/main/java/com/garbagemule/MobArena/ArenaImpl.java
@@ -1162,6 +1162,9 @@ public class ArenaImpl implements Arena
         }
         
         InventoryManager.clearInventory(p);
+        p.getActivePotionEffects().stream()
+            .map(PotionEffect::getType)
+            .forEach(p::removePotionEffect);
         
         arenaPlayer.setArenaClass(arenaClass);
         arenaClass.grantItems(p);
diff --git a/src/main/java/com/garbagemule/MobArena/things/PotionEffectThing.java b/src/main/java/com/garbagemule/MobArena/things/PotionEffectThing.java
new file mode 100644
index 0000000..23ea968
--- /dev/null
+++ b/src/main/java/com/garbagemule/MobArena/things/PotionEffectThing.java
@@ -0,0 +1,28 @@
+package com.garbagemule.MobArena.things;
+
+import org.bukkit.entity.Player;
+import org.bukkit.potion.PotionEffect;
+
+class PotionEffectThing implements Thing {
+    private final PotionEffect effect;
+
+    PotionEffectThing(PotionEffect effect) {
+        this.effect = effect;
+    }
+
+    @Override
+    public boolean giveTo(Player player) {
+        return player.addPotionEffect(effect, true);
+    }
+
+    @Override
+    public boolean takeFrom(Player player) {
+        player.removePotionEffect(effect.getType());
+        return true;
+    }
+
+    @Override
+    public boolean heldBy(Player player) {
+        return player.hasPotionEffect(effect.getType());
+    }
+}
diff --git a/src/main/java/com/garbagemule/MobArena/things/PotionEffectThingParser.java b/src/main/java/com/garbagemule/MobArena/things/PotionEffectThingParser.java
new file mode 100644
index 0000000..2d77396
--- /dev/null
+++ b/src/main/java/com/garbagemule/MobArena/things/PotionEffectThingParser.java
@@ -0,0 +1,28 @@
+package com.garbagemule.MobArena.things;
+
+import com.garbagemule.MobArena.util.PotionEffectParser;
+import org.bukkit.potion.PotionEffect;
+
+class PotionEffectThingParser implements ThingParser {
+    private static final String PREFIX = "effect:";
+
+    @Override
+    public PotionEffectThing parse(String s) {
+        String value = trimPrefix(s);
+        if (value == null) {
+            return null;
+        }
+        PotionEffect effect = PotionEffectParser.parsePotionEffect(value, false);
+        if (effect == null) {
+            return null;
+        }
+        return new PotionEffectThing(effect);
+    }
+
+    private String trimPrefix(String s) {
+        if (s.startsWith(PREFIX)) {
+            return s.substring(PREFIX.length());
+        }
+        return null;
+    }
+}
diff --git a/src/main/java/com/garbagemule/MobArena/things/ThingManager.java b/src/main/java/com/garbagemule/MobArena/things/ThingManager.java
index 4dc72df..71c4428 100644
--- a/src/main/java/com/garbagemule/MobArena/things/ThingManager.java
+++ b/src/main/java/com/garbagemule/MobArena/things/ThingManager.java
@@ -13,6 +13,7 @@ public class ThingManager implements ThingParser {
         parsers = new ArrayList<>();
         parsers.add(new CommandThingParser());
         parsers.add(new MoneyThingParser(plugin));
+        parsers.add(new PotionEffectThingParser());
         items = parser;
     }
 
diff --git a/src/main/java/com/garbagemule/MobArena/util/PotionEffectParser.java b/src/main/java/com/garbagemule/MobArena/util/PotionEffectParser.java
index 666d823..5f694c2 100644
--- a/src/main/java/com/garbagemule/MobArena/util/PotionEffectParser.java
+++ b/src/main/java/com/garbagemule/MobArena/util/PotionEffectParser.java
@@ -29,6 +29,10 @@ public class PotionEffectParser
     }
     
     public static PotionEffect parsePotionEffect(String p) {
+        return parsePotionEffect(p, true);
+    }
+    
+    public static PotionEffect parsePotionEffect(String p, boolean logFailure) {
         if (p == null || p.isEmpty())
             return null;
         
@@ -48,7 +52,9 @@ public class PotionEffectParser
         }
         
         if (result == null) {
-            Bukkit.getLogger().warning("[MobArena] Failed to parse potion effect: " + p);
+            if (logFailure) {
+                Bukkit.getLogger().warning("[MobArena] Failed to parse potion effect: " + p);
+            }
             return null;
         }