|Release date||20 November 2012 (Update)|
|Harness your adrenaline to increase melee damage dealt by 100% for 20 seconds. Also increases all damage taken by 50%.|
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Berserk is an ultimate Strength ability. For 20 seconds, all melee damage dealt by the player, excluding bleeds or Onslaught, is doubled and damage taken from monsters and other players is increased by 50%.
Berserk significantly increases DPS; however, players should be careful if they are receiving high damage themselves, as the damage could potentially be increased towards fatal levels. With Berserk and the best melee equipment, prayers, stats and potions, one can hit over 10,000 per hit of Assault. Since it does not increase bleed damage (e.g. Dismember, Slaughter and Blood Tendrils), using these abilities should be avoided during Berserk's duration.
If you attack someone with Berserk activated before they attack you, the Berserk effect is removed.
Berserk does not increase damage from "hard" typeless damage (typeless damage that cannot be reduced by defence abilities), including self-inflicted damage like from Blood Tendrils, but it does for "soft" typeless damage.
The Magic equivalent of this ability is Metamorphosis. Metamorphosis only increases damage output by 62.5% and last 15 seconds, but it does not increase the user's damage taken.
- As of the 4 June 2013 update, Berserk has been tweaked to enable NPCs to deal more damage against players. It now also only increases damage taken by 50% instead of 100%. Before that, it used to increase all damage dealt, but also all damage received, by 100% for 20 seconds also reducing armour rating by 50%.
- Before the 25 January 2016 update, Berserk reduced the user's armour rating by 50%.
- During the Evolution of Combat beta Berserk initially had a duration of 10 seconds, which was later increased to 30 seconds near release. However, the duration was quickly lowered down to 20 seconds because players in the beta found out it was possible to use it with a second ultimate ability and instantly kill players. While it is still technically possible to gain enough adrenaline to use an ultimate before Berserk runs out, the lower duration makes it significantly more challenging to use thresholds alongside the ultimate.