clear-wave-leeway.
Introduces a new arena setting that changes the "emptiness check" for `clear-wave-before-next`, `clear-wave-before-boss`, and the final wave check, allowing for a customizable _leeway_. By default, the leeway is 0, which means the monster set has to be completely empty for the checks to pass. With a value of 2, the set may contain up to two monsters for the checks to pass, and so on. The leeway should help alleviate some of the issues some people have with their arena sessions when monsters "disappear" behind terrain or end up in hard-to-reach areas. This is by no means a real "solution" to the underlying problem, since the build-up of monsters in longer sessions will just result in the issue being pushed to later waves. We'll see if the setting leaves any additional customization to be desired and perhaps defer any such requests to the Sessions Rework. Closes #706
MobArena 
MobArena is an arena-style minigame for Spigot-based Minecraft servers
Getting Started
If you don't want to compile the plugin yourself, grab a release artifact from one of these two sites:
The wiki here on Github should have all the information you need to get started using the plugin.
Getting Help
If you run into problems or need help with something, feel free to hop on the MobArena Discord server to have a chat: Instant Invite
Remember, though, that this communication channel is idle chat, which means you likely won't get a response immediately. It could take anything from a couple of seconds to a day, but your message will be seen.
Contributing
Found a bug, got a suggestion, or want to dig into the code base? There are many ways to contribute to the project!
Get started here: Contributing