Demonic Sacrifice was a warlock spell available via talent that sacrificed a summoned demon to grant a powerful buff that lasted 30 min. Each warlock demon granted a different buff when sacrificed. The effect was canceled if any Demon was summoned. Imp: Increased your Fire damage by 15%. Voidwalker: Restored 2% of total Health every 4 sec. Changed from 3% in 2.0. Succubus: Increased your Shadow damage by 15%. Felhunter: Restored 3% of total Mana every 4 sec. Felguard: Increased your Shadow damage by 10% and restored 2% of total mana every 4 seconds.