Shroomloin

The Shroomloin is a neutral mob added by Infernal Expansion. It can be provoked by destroying blocks in the Crimson Forest or by attacking it directly. When provoked, it throws Ascus Bombs at its assailant. When killed, Shroomloins drop one to two Ascus Bombs.

It can be lured with a or. When fed a non-Crimson fungus, it will not attack the player if they destroy the Crimson Forest.

Developer details
The Shroomloin will attack any players which destroy blocks with the  tag.