Heavy affliction builds like Unstable Affliction/Shadowburn can also be effective due to the fact that they use many instant casts, allowing the warlock to stay mobile, powerful life draining and also include Unstable Affliction for use against dispelling classes. The premier arena build for warlocks is generally considered to be Soul Link/Siphon Life for its survivability, instant cast DoTs and powerful life draining. 4.4 Nightfall / Shadowfury (NF/Conf with Shadowfury) (18/0/43).