Crackling is an Inventionperk that periodically zaps the target for 50% ability damage per rank in PvM, or 10% per rank in PvP. It can be created in weapon and armour gizmos.
The damage done is based on the weapon's main-hand combat type. It activates every 60 seconds in combat. Some damage modifiers are taken into account when calculating the damage. Crackling takes adrenaline from the player's opponent in PvP.