Set bonuses: Edit
2) Each time a foe affected by Bone Chill is hit by a Frost spell, the damage of Cold Death on that foe is increased by 10%. Stacks infinitely.
3) Corpse Shatter is twice as likely to trigger and will spread any Cold Death bonus damage stacks to all foes hit.
4) Each trigger of Bone Chill adds 10% damage reduction to the Warlock, stacking up to 40% and lasting 7 seconds.
Helm, Armor, Spellbook (Offhand), Staff.