Set bonuses: Edit
2) Having an active Ritual skill adds 1 stack of Masochism per second. In additiona, Masochism stacks 10 more times.
3) Bane skills weaken enemies on hit, increasing the damage they take from Bane skills by 30%. This effect stacks infinitely.
4) Each stack of Masochism reduces the damage taken by the Warlock by 5%, up to 40%.
Helm, Armor, Spellbook (Offhand), Staff.