Adrenaline

Certain Warrior skills are fueled by adrenaline rather than energy. It is gradually built up each time the Warrior hits or is struck in combat, each such blow being added to the characters adrenaline level. Some skills increase the rate of adrenaline build up, while others expend it entirely.

Adrenaline Points
Adrenaline is not actually gained in strikes, but in points. Every adrenaline skill stores its own adrenaline points displayed by rising flames from 0 until fully charged. See this table for approximate number of adrenaline points needed for skills.

1 4 "strikes" on Cleave do not equal 4 "strikes" on Sever Artery. The "Points needed" column increases linearly; the "adrenaline strikes needed" in the skill descriptions are a simplification. A "strike" of adrenaline in the skill description equals 20-25 points. A real "strike" of adrenaline gives 25 points.

Gaining adrenaline
Gaining adrenaline means every adrenaline skill in your bar gains that many points. For every attack you make that hits, you gain 25 adrenaline points. For every 1% of health lost from your maximum, you gain 1 point of adrenaline. Runes count against the maximum health. Gain is calculated on a per-attack basis. For every 25% of your health lost, you gain approximately 1 "strike" of adrenaline--the equivalent of an attack landing. Note that health lost includes ranged attacks but excludes health degeneration. Commonly, 4 strike skills are charged in about 3 hits time, because you take some damage at the same time, assuming that the opponent is attacking you.


 * Soothing Images sets all adrenaline gain to 0. You can still use adrenaline attacks under Soothing Images if they are charged; the skill just prevents you gaining any more adrenaline until it ends.

Using adrenaline
You can only use adrenaline skills that are fully charged with adrenaline. They cost 0 Energy. When you use an adrenaline skill, all adrenaline skills in your bar lose 25 points. These lost 25 points can be recovered with your next hit (including the adrenaline attack itself), or by taking as much damage as 25% of your maximum health. Although using and adrenaline skill empties it's pool, it also gains 25 points if it hits.

Losing adrenaline
Losing adrenaline means every adrenaline skill in your bar loses its full load of adrenaline. For attack skills with this attribute, the effect comes after the 25 points each skill gains if the attack hits, so all pools will be at 0. You lose all adrenaline after you have not been attacked, and do not attack for 20 seconds, or when you die.


 * Some warrior skills cause "...lose all adrenaline." These skills are: Hammer Bash, Heavy Blow, Wild Blow, Final Thrust, "On Your Knees!" and Shove.
 * Sympathetic Visage and Ancestor's Visage causes a loss of all adrenaline when an adjacent foet enchanted with it is struck.
 * Blackout also causes a loss of all adrenaline in addition to disabling all skills.
 * Wail of Doom is similar to Blackout but disables only attack skills.

Skills that boost adrenaline

 * With Berserker Stance you gain 30 points every time you hit in melee (instead of 25).
 * With "For Great Justice!" all your adrenaline gain is increased by 50%, rounded down.
 * With Battle Rage you gain 50 points every time you attack.
 * With "To the Limit!" you gain 25 points for each foe in the area (max 25...125).
 * With Wary Stance you gain 35 points every time you block an attack skill.
 * With Ferocious Strike you gain +3...10 points if your pet hits.
 * With Balthazar's Spirit you gain +2...5 points every time you take damage.
 * With Dark Fury you gain +25 points if you hit.

Reference
Research done by Ensign and Silmor. Original GW Guru thread.

It is believed that Ferocious Strike and Balts Spirit both only give 1 strike of adren gain, no matter what your skill may be.