e4c6b47f___Miscellaneous___Status_Guide__Effects_On_Character
[Status Effect] Berserk [How To Cure Effect] Remedy item, Esuna spell [Effects On Character] 
Character goes into battle fury, turns red, and starts performing physical attacks randomly on the enemy. Character cannot be controlled until cured.
The RPG Place - Final Fantasy VII - Miscellaneous - Status Guide
Effects On Character