Concussion is a Barbarian passive skill from the Ultimate skill tree.
Lucky Hit: Skills using Bludgeoning weapons have up to a 10 / 20 / 30% chance to Stun (CC) enemies for 3 seconds, or up to a 15 / 30 / 45% chance when using a Two-Handed Bludgeoning weapon.
Requires a point in Wallop.
