|Release date||20 November 2012 (Update)|
|Rend your target, dealing up to 188% of both weapons[sic] damage instantly and causing an additional 313% of weapon damage over 6 seconds.|
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Massacre is an ultimate Attack ability found in the Ability Book. It requires level 66 Attack and for the player to be dual wielding weapons. It has a cooldown time of 60 seconds. When activated, the player deals 37.6-188% of ability damage to their target and causes the target to take additional damage over 6 seconds, dealing 5 hits that total to 313.33% of ability damage.
The ranged equivalent of this ability is Deadshot; however Deadshot does not require the player to dual wield weapons and is unlocked at a much lower level, and additionally only has 30 seconds cooldown instead of 60 seconds.