Berserk is a status in Final Fantasy X-2. Berserk increases damage dealt and HP restoration by 25%, but causes the afflicted to attack uncontrollably. It wears off on its own. Berserk granted via Assault ignores immunities.
In addition, the Bloodlust puts the wearer under constant Berserk. The Cat Nip also puts the wearer under constant Berserk, but only in the International and HD versions of the game.
Inflicts Petrify, Sleep, Darkness, Silence, Poison, Confusion, Itchy (always), Berserk, and Stop as well as reducing Magic and Strength levels by 10 (both always) on the party.
Mushroom Cloud
Really Bad Breath
Inflicts Poison, Darkness, Silence, Confusion, Berserk, Slow, and Curse to the party.
Great Malboro
Touch-and-Go
Inflicts non-elemental damage and Berserk to one target.