GuildPlanner.Pro

(2 items) Adds 618 Critical Chance
(3 items) Adds 121 Magicka Recovery
(4 items) Adds 121 Weapon and Spell Damage
(5 items) When you deal damage with a Light or Heavy Attack, you put a Mark of Revenge on the enemy for 15 seconds. After stacking 5 Marks of Revenge on an enemy they detonate for 1462 Magic Damage.

You can only apply a stack once every half second and the damage scales off the higher of your Weapon or Spell Damage.