Frenzied Berserker enhancements

Tier One
Requires Die Hard, Barbarian level 1

Tier Two
Requires Barbarian Level 2, 5 APs spent in tree

Tier Three
Requires Barbarian Level 3, 10 APs spent in tree

Tier Four
Requires Barbarian Level 4, 20 APs spent in tree

Tier Five
Requires Barbarian Level 5, Character Level 12, 30 APs spent in tree