Minecraft wiki entry for Vex, associated text: Vexes attack players, adult villagers, iron golems, and wandering traders if an evoker summoned them, and any other target as commanded by their summoning evoker (any mob that attacks the evoker, either by accident or purposely or any mob illagers naturally attack on sight). They still attack these mobs even when they do not have a weapon, and they deal the same damage.