Season 2 Shadow arena set. Keep at least 4-piece Merciless Gladiator's Raiment (the priest-only Satin pieces) for the +35 Resilience and Weakened Soul reduction bonuses - the Mooncloth (Investiture) pieces are the healer set, not yours. Stack stamina, resilience and shadow damage; fill offset slots with Veteran's Dreadweave honor pieces and the strongest stamina/spell-damage drops from Karazhan, SSC and The Eye.