A gorilla/slug monster with only two special attacks, which are Gorilla Crush, a damaging attack, and Slug Slime, which makes one of your allies not attack or anything for one whole turn.
4000 health and 300 damage per attack means high health, and low attack.
Gorilla Crush: Does 1250 damage to one your allies. Slug Slime: Makes one of your allies not be able to do an action for one whole turn.
Usually Slugrilla starts with attacking and about every four turns will do Gorilla Crush and afterwards do Slug Slime.