Dungeon Crawl Classics
Hide of the Cave Bear
Berserker Rage 1/day per character level.
+2 attack and damage, +2 hp per level, +2 to Fort Saves, -2 to AC.
1d5 rounds + Character Level…
After rage, loses all bonuses and become fatigued (1/2 current hp, cannot run or charge). For the same length as the rage.