You probably noticed, back when I posted my version of berserk barbarians, that my berserk rules are pretty understated: berserkers are Hasted and strike first against non-Hasted opponents, plus they get +2 to attack.
A lot of people read much more into the idea of going berserk. Two frequent interpretations are:
- Berserkers ignore wounds. They don't notice they are damaged until the combat is over. They may even ignore death.
- Once they start fighting, berserkers have a hard time stopping. They sometimes attack their friends.
- Ignore Wounds: Count how many times an enemy hits a berserker, but skip damage rolls. Roll all damage when the berserker take a critical hit (4 above what's needed to hit, or natural 20) or when the combat ends.
- Keep Fighting: Berserker must keep rolling attacks until they do 5+ damage on a single hit, or until someone stops them some other way. For friendly targets, have everyone near the berserker roll a d6; closest person whose d6 roll matches takes the hit.