Make all mobs/animals behave like the creeper
A server-side mod/challenge that changes all mobs AI's into that of the creeper, making all of them try to explode the player.
The mod IS possible to beat, although extremely difficult. Especially when you reach the end where the endermen will chase you and they are extremely quick.
This mod does change the Spawners blast resistance, so that blazes don't blow up their own spawners, as that seemed to infuriating than to keep it how it is. But i plan to make that configurable via Mod Menu in the future.
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