Berserker

The berserker special ability is in the depot. At the end of each combat round, and at some stages during the round (taking damage or killing a foe), a berserker has the chance of flying into a berserk rage that lasts until the end of combat or the berserker is knocked unconscious.

While berserk, the character can only take attack actions. He or she does benefit from an impressive list of positive and negative modifiers. The most notable positive is the fact that all attacks do double damage. The most notable negatives are probably decreases to defence and stealth.

The chance of berserking is closely tied to how much damage the character has taken. Characters with this ability will usually go berserk as their hit point drop towards zero.

In line with the character class refactor mentioned earlier, the Warrior now gets this ability. Berserk makes a good synergy with this class's existing immunity to KO. I'll probably add this special ability to one of the standard races too (they'll be getting two abilities each too) - maybe the Troll or the Yeti.