The Impact Mod is a reward for completing the Last Chance on the Wallquest in Dead Island. This mod adds Electrical Damage to a Blunt weapon. Critical hits with this mod will stun enemys momentarily while damaging them for a few seconds.
The Impact Mod is exclusively available for blunt weapons. Though it causes an electrocution effect like the Lightning Mod, the real power of this mod is that is causes a struck enemy to go flying through the air on a critical hit. An enemy sent flying is often killed on impact. Even if the target is not killed, the player is given an opportunity to perform an instant stomp kill while the enemy is recovering. This can be very useful against enemies with a lot of health, such as Thugs.