Berserk (Minsc)

Berserk (Minsc) is an innate ability unique to Minsc, it may cause him to lose control and potentially attack friendly party members.

In-game description
"Minsc becomes enraged for 2 turns. While enraged, he gains a +2 bonus to his Strength and Dexterity and becomes immune to charm, confusion, fear, feeblemind, hold, level drain, maze, stun, and sleep. He also gains 15 temporary Hit Points, which are taken away at the end of the berserk spree (possibly knocking him unconscious)."