With the AbyssalCraft mob, some of the spawns in a mob farm will be demon animals, which leave behind a couple blocks of fire when they are killed. This would not be much of a problem if the fire burned out after a while, but since firetick is disabled, the fire will stay there forever. This causes mob farms to look like this after a few minutes: This means: Before you get cursed earth, you can't easily make a mob farm, and even with cursed earth, endermen will teleport out before they can get killed by any grinder.
