2 items: Adds 15-657 Spell Critical
3 items: Adds 15-657 Spell Critical
4 items: Adds 3-129 Spell Damage
5 items: Enemies you damage with fully-charged Heavy Attacks are afflicted with Minor Vulnerability for 10 seconds, increasing their damage taken by 5%.
The set consists of light armor and jewelry in all slots, as well as weapons and shields of all types.