Wikia

Grimoire of Sacrifice
Grimoire of Sacrifice Unlimited range 2 min cooldown Instant cast You sacrifice your demon to gain one of its abilities, increase the power of many of your single target spells by (Affliction 25%; Demonology 15%; Destruction 25%) and regenerate 2% of maximum health every 5 sec. Lasts for 1 hour. Summoning another demon cancels the effect.
Usable by
Class	Warlock
Properties
School	Shadow
Cooldown	2 min
Talents
Talented	Yes
Level required	75
Related buff
Grimoire of Sacrifice Restores 2% of maximum health every 5 sec. Affliction Damage dealt by Malefic Grasp, Drain Soul, Haunt and Fel Flame increased by 25%. Demonology Damage dealt by Shadow Bolt, Soul Fire, Hand of Gul'dan, Metamorphosis Melee, Wild Imps and Fel Flame increased by 15%. Destruction Damage dealt by Incinerate, Conflagrate, Shadowburn, Chaos Bolt and Fel Flame increased by 25%. Spells modified by Fire and Brimstone are unaffected. Duration: 1 hour

Grimoire of Sacrifice is a warlock talent available at level 75.

Modified by

Patch 5.2.0 (5-Mar-2013): Grimoire of Sacrifice now increases the damage of abilities by 15% (was 25%) for Destruction Warlocks and 25% (was 50%) for Affliction Warlocks. In addition, it now provides the spell Whiplash instead of Seduction when a Succubus is sacrificed.; Grimoire of Service now describes its special abilities on the tooltip.
Patch 5.1.0 (27-Nov-2012): The additional damage Grimoire of Sacrifice grants to Chaos Bolt is now dealt over 3 seconds. This damage over time behaves in a manner similar to a Mage's Ignite, where each new damage over time effect rolls into the previous one. This means that no damage is lost if a new damage over time component is re-applied before an existing one fades.
Patch 5.0.4 (28 August 2012): Added.