Berserk
Accrued at Warrior Job Level 15, Berserk: Enhances attack but weakens defense. But unlike its counterpart, Defender, it cannot be utilized as an "always up" skill. Warriors predate even Paladins and were intended to tank or punish mobs with impunity.

Here is my idea:

Berserk (Current)
Duration 180 Seconds
Recast 300 Seconds

Berserk (Proposed)
Duration 180 Seconds
Recast 180 Seconds