Berserk is a mental, mundane disadvantage, described in Basic Set, p. 124. It has the special enhancement Battle Rage. It is referenced in GURPS Martial Arts, p. 179, on use of techniques by Berserk characters.
- On its pricing 
- On how the bad more than balances the good 
- On compatibility with Unfazeable 
- On its separation from Bad Temper in 4th Edition