TwoSix
Everyone's literal second-favorite poster
Barbarian rage seems like a good candidate for an escalation dice mechanic, where the rage gets stronger the longer the barbarian maintains it. The penalty the barbarian endures afterwards is larger the longer the rage continues.I think fatigued for the rest of the encounter is a bad mechanic for ending a rage. But maybe they can still have a form of fatigued that lasts only one round after a rage.
It would be not so crippling and would be easier for the players to remember.
Rage for 1 round = fatigued for 1 round.
Rage for 3 rounds = fatigued for 5 minutes
Rage for 5 rounds = falls unconscious for an hour.
Obviously, the bonuses for rage should be escalating as well. A barbarian who's been raging for 4-5 rounds should be a killing machine, while a barbarian who's only in the 1st round might just be equal to a fighter. Make the barbarian the omega striker. If you don't take him down early, he's going to win the battle for you, because he won't go down.