Evistro

An Evistro is type of Demon that is commonly used as 'footman' in the Blood War.

Evistro © WotC

Physically they resemble fanged, hairless, red-skinned gorillas and many scholars would suggest that they have intellects to match. Definitely, even for Demons, Eviostro don't seem either interested or capable of planning to any degree.

Also known as "Carnage Demons", Evistro's are (even by demonic standards) pretty dim, They seek to just cause destruction.