Every mob turns into Withers. Except for Endermen, Blazes, and the Dragon. The goal is to beat the game.
Inspired by Azp3ct's video, "Can You Beat Minecraft if Every Mob is the Wither?"
plugins folder.This plugin applies to all worlds, and will cause destruction to your worlds.
The End has the Endermen replaced with Withers instead. Blazes and endermen still spawn naturally.

The time is always set to night, although it appears to look like day, add torches everywhere!

I'd love to hear them, create an issue, and let's see if it can be implemented.
This plugin is licensed under MIT.