Vex is a small, flying hostile mob that wields an iron sword and is summoned exclusively by evokers. It lunges at its target to attack and has the unique ability to phase through walls, making it extremely difficult to escape or defend against. Vexes are considered the negative counterpart to the allay, as both are flying mobs with similar movement patterns.

Vexes do not drop any items but grant 5 experience when killed by a player.

Vexes cannot be bred and do not spawn naturally. They are only summoned by evokers during their summoning spell, appearing in groups of three. An evoker can continue summoning vexes even if some from the previous attack are still alive. If a Vex's spawning point is obstructed by blocks, it will fail to spawn.

Vexes are hostile mobs that rapidly fly toward their targets, phasing through walls and obstacles to attack with their iron swords. Their unpredictable movement and ability to ignore terrain make them one of the most dangerous mobs in raids and woodland mansions. Despite their small size, they deal high melee damage and move faster than most mobs, making them difficult to hit.