Info

Sacrifice is a basic Constitution ability, that can be unlocked for 3,500 Reward Currency from the Anima Islands Distraction & Diversion, which became available following the fall of Tuska at the Tuska Comes world event. It requires level 10 Constitution to use. 

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When Sacrifice is used, the player deals 20-100% 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.

 

It was first obtainable by participating in the second world event, at a cost of 21,000 renown and a gold event token. With the death of Bandos and end of the event, it can now be obtained as a rare drop from General Graardor and Kree'arra. It is also obtainable from their bodyguards and from other aviansie in Armadyl's Eyrie and other Bandos followers within the dungeon. 

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These abilities are individual drops, however it is possible to receive multiple abilities in a single kill. When received as a drop it is automatically learned; it does not drop as an item. When learned, the message "You have unlocked the Sacrifice ability!" appears in the chatbox. 

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If the Swift gloves' extra shot passive effect activates while using Sacrifice, both hits will heal the player.

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Tactics

While training combat, it may be helpful to save Sacrifice until you are nearly certain that it will kill your target. However, mistiming Sacrifice may result in less-than-expected healing.

• Berserk and similar effects can increase the damage of Sacrifice. In general, when Sacrifice's damage is increased, its healing is increased as well.

 

https://runescape.wiki/w/Sacrifice