When I was messing with Zombified piglins and illagers, I noticed that vex attempt to attack each other. No idea how this happened, but we need to make them accidentally attack Zombified piglins and other illagers will attack them as well, but then Evoker's vex go berserk and try to attack each other.

Sorry, I can't provide a screenshot due to this happening very quickly before I can even make it.

Possibly a duplicate.