Adrenaline

Adrenaline is a combat mechanism used with abilities. It is displayed as a percentage on the action bar, next to a player's life points.

Adrenaline is used to determine what abilities a player may use. A player generates adrenaline through auto-attacks and Basic abilities. Threshold abilities require 50% adrenaline and drain 15% when used, and Ultimate abilities require the whole bar and drain it completely. When a player is out of combat for 10 seconds, their adrenaline bar rapidly drains back to zero.

A player may influence their adrenaline by using various potions, prayers and equipment, and they may preserve their adrenaline by the act of adrenaline stalling, which is described in a section below.

Gaining and using adrenaline
These are all the actions that influence a player's adrenaline.
 * Auto-attack with main-hand: +2%
 * Auto-attack with off-hand: +1%
 * Auto-attack with two-hand: +3%
 * Basic ability: +8%
 * Threshold ability: -15%
 * Ultimate ability: -100%
 * Out of combat: -5% per tick
 * Consuming food: -10% (only during combat; note that it takes a bit of time to come out of combat stance and for the adrenaline to start draining, but players can eat immediately after their opponent is dead and their adrenaline will not be drained)
 * Regenerate: -10% per tick
 * Super Guthix rest: +15%
 * Adrenaline potion: +25%
 * Sap Spirit: -%? to target
 * Leech Adrenaline: +%?
 * Enchanted ascendri bolts special: +1% per hit
 * Basic abilities with the Reduced Adrenaline handicap in the Dominion Tower: 6%

Adrenaline stalling
In some situations, a player may want to preserve their adrenaline while not in combat. This is frequently done in the God Wars Dungeon when waiting for boss respawns or when Dungeoneering.

To adrenaline stall, one maintains their combat stance by using Basic abilities that are available outside of combat. These are Anticipation, Freedom, and one out of Barge, Escape or Surge (the three movement abilities share a cooldown). To stall effectively, one must use an ability only when their combat stance is about to end.

Because of cooldowns, one can only stall for a short time unless they use a shield, which provides the abilities Resonance and Preparation and lets them stall indefinitely.

Adrenaline in NPCs
Some NPCs can use the adrenaline system and use abilities accordingly. These NPCs so far are the combatants in Wilderness Warbands, and the enemies from the quests The Blood Pact and Birthright of the Dwarves.

Several units in the Battle of Lumbridge and The Bird and the Beast were also able to use adrenaline. They would only gain adrenaline when fighting against players.

Penance Fighters and Penance Rangers from Barbarian Assault utilise adrenaline after the rework. Adrenaline