this might be interresting
Beserker Rage
May use Enrage ability once per day per 4 levels. While enraged: +2 to hit, +2 damage, -2 AC. The berserker at this time is immune to charm, hold, fear, maze, imprisonment, stun and sleep. He also gains 15 hit points while enraged. These hit points are temporary, and are taken away at the end of his berserk spree, possibly killing the berserker.
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The Last Of the Red Fluffies