The Fear status effect prevents enemies from moving or taking action AND causes the affected target to run away for a short duration. It can be removed through Unstoppable or Immune effects.
Fear (a.k.a. Sends Enemy Flee in Fear) is a type of Crowd Control effect in Diablo 4. Fear has no effect on bosses.
You have a base {#} chance to Fear enemies when you damage them.
This probability scales with the Skill used and your Lucky Hit Chance Bonus.