Barbarian enhancements (history)

Level 1

 * Barbarian's Action Boost I: Grants the ability to receive short-term boosts to weapon damage, damage reduction, or movement speed.
 * Barbarian's Intimidation: Intimidated foes are shaken
 * Barbarian's Power Attack: +1 bonus to damage with Power Attack feat active
 * Extend Rage I: Rage lasts 25% longer
 * Fast Recovery I: -20% fatigue duration after Rage (There may be a minimum constitution prerequisite for this enhancement.)
 * Skill Athleticism I: +3 on swimming and jumping checks
 * Skill Interaction I: +3 on intimidate and listen checks

Level 2

 * Barbarian Constitution I: +1 Constitution
 * Extra Rage I: Grants an extra Rage during rest periods
 * Power Rage I: Additional +2 Strength while in Rage
 * Resist Disease I: Grants a +3 bonus to Disease saving throws
 * Resist Poison I: Grants a +3 bonus to Poison saving throws

Level 3

 * Barbarian's Action Boost II: grants the ability to receive short-term boosts to weapon damage, damage reduction, or movement speed. There are 5 total uses of any of the above, per rest.  Each use lasts 20 seconds, and can be re-activated 10 seconds after that.  The damage boost is +4 and the DR level is 8 (which does not stack with the barbarian's permanent DR).  Higher level versions of this enhancement give larger bonuses, but for the same usage periods.
 * Skill Athleticism II: +4 on swimming and jumping checks
 * Skill Interaction II: +4 on intimidate and listen checks

Level 5

 * Barbarian's Action Boost III: grants the ability to receive short-term boosts to weapon damage, damage reduction, or movement speed.
 * Barbarian Constitution II: +2 Constitution
 * Skill Athleticism III: +5 on swimming and jumping checks
 * Skill Interaction III: +5 on intimidate and listen checks

Level 7

 * Barbarian's Action Boost IV: grants the ability to receive short-term boosts to weapon damage, damage reduction, or movement speed.
 * Skill Athleticism IV: +6 on swimming and jumping checks
 * Skill Interaction IV: +6 on intimidate and listen checks

Level 8

 * Barbarian Constitution III: +3 Constitution

Level 9

 * Barbarian's Action Boost V: grants the ability to receive short-term boosts to weapon damage, damage reduction, or movement speed.
 * Skill Athleticism V: +7 on swimming and jumping checks
 * Skill Interaction V: +7 on intimidate and listen checks