Sacrifice is a basic ability, one of three abilities released with the second world event, The Bird and the Beast. It was purchasable at the event with 21,000 renown and a gold event token, and requires level 10 Constitution to use. Now the event is over, it can be obtained as a very rare drop from General Graardor and Kree'arra[1]. When received as a drop from the generals, it is automatically learned; it does not drop as an item. When received as a drop, the message You have unlocked the Sacrifice ability! appears in the chatbox.
When Sacrifice is used, the player deals up to 100% weapon damage to their target regardless of protection prayers, and is healed by 25% of the damage dealt, or 100% if the ability kills the target.
Sacrifice is a basic ability. Unlike other basic constitution abilities, it does generate adrenaline.
While training Combat, it may be helpful to time your hits so that you heal a good amount of HP from using this ability. Wait until your opponent is relatively close to dying, then use the ability. Do not use it too early or too late; otherwise only a negligible amount will be healed.
Trivia
Sacrifice initially always did 100% of the weapon damage. This was changed on 17 December2013. The ability now deals damage up to 100%.
When released, the ability did not work with magic weapons. This was fixed on 17 December 2013. It can also be used without a weapon.
When released, it initially did not generate any adrenaline.
The ability only bypasses protection prayers from other players. It will not hit through the prayers of monsters such as Elite black knights.
References
^Mod Moltare. Twitter. 11 December 2013. "Will the abilities be available after the event ends? -yes, as a very rare drop from Graardor and Kree."*
