Barbarian Rage (1x per day) (NWN)

Specifics
The barbarian may rage, gaining a +4 morale bonus to Strength and Constitution and +2 to all Will saving throws, in exchange for a -2 penalty to Armor Class. The barbarian may use the ability once per day at first level, +1 use per day at level 4, and every 4 levels thereafter, extending into epic levels.