For some the path of the Barbarian is not a choice, it’s a curse that they are lucky if they can control.
An Unwilling Barbarian cannot control his rage ability either to start or to end it. Preventing or Ending rage requires Will Saves with varying DCs. An unwilling barbarian never attacks allies while raged, but if they are still raging when all enemies are defeated they being to attack the nearest inanimate object until it’s destroyed and continue to do so until they exit rage.
Rage triggers are things that can trigger a rage.
If a Unwilling Barbarian is attacked, but not injured he must make a DC 10 Will Save or enter rage on his next action.
Party Being Attacked
If the party is attacked the unwilling barbarian must make a DC 5 Will Save or enter rage. If the party is out numbered the DC increases by one for each additional opponent. If the party out numbers the attackers the DC decreases by one for each additional party member.
If an unwilling barbarian is damaged he must make a DC 10 + the Damage taken Will Save or enter rage on his next action.
Being Hit with a Critical Hit
If an unwilling barbarian is hit with a confirmed critical hit they automatically enter rage on their next turn.
An unwilling barbarian cannot exit rage once he’s started unless all enemies are defeated, even then he continues to rage until he gets himself under control attacking nearby inanimate objects until they are destroyed.
On each round after combat ends the unwilling barbarian makes a will save DC 10 plus the number of rounds they were raged for. If they fail they attack the nearest unattended inanimate object with the weapon(s) they were last wielding when combat ended. For each round after the first the DC for this check decreases by two.
Rage automatically ends if the Barbarian runs out of rounds of rage.
An unwilling barbarian at constant war with their rage, in doing so they have gained a reserve of willpower beyond normal. A unwilling barbarian has a number willpower points equal to their wisdom modifier plus four, and they gain two each time they level after first level. Any time the barbarian is required to make a Will save of any kind they may use a point of willpower to give themselves a +1 to the save. At every third level the bonus granted by willpower increases by plus one. Only a single point of willpower may be used per will save. Additionally the barbarian can spend a point of willpower to attempt to exit rage, they get no bonuses for the point of willpower but can immediately make a new will save to exit rage against a DC 10 plus the number of rounds they were raged, this can be done once a round as a free action. The barbarian can use this ability while raged.
Shake it off
At 7th level an unwilling barbarian gains the ability to shake of effects on their willpower. They can spend a point of willpower to try to end an effect that required a will save early, by making a new save, they get no bonuses from their willpower for this save. This may be attempted once a round as a free action, but cannot be done in the same round they try to exit rage using willpower.
This ability replaces Damage Reduction gained at 7th level
Force of Will
At 10th level the barbarian gains the bonuses from their willpower when trying to end rage or a will based effect early.
This ability replaces Damage Reduction gained at 10th level
Mind over Body
At 13th level the barbarian can use their willpower ability on fortitude saves as well. However they cannot gain the benefits of Force of Will on fortitude saves.
This ability replaces Damage Reduction gained at 13th level.
At 16th level the barbarian rolls twice when making will saves and takes the best result.
This ability replaces Damage Reduction gained at 16th and 19th level