Vex

A vex is a flying hostile mob that is summoned by another hostile mob, the evoker.

Behavior
Vexes are hostile mobs that will attack players or villagers, as commanded by the evokers. They can float around their targets, and can pass through walls. When they are attacking, they will glow red and lunge at their target.

If vexes are summoned by an evoker, they will start to take damage after a certain amount of time, and eventually die. This does not apply if it is summoned by spawn eggs, or summoned with the command.

Data values
Vexes have entity data associated with them that contain various properties of the mob. Their entity ID is.