Kensei enhancements

Tier One
Requires Kensei Focus, Fighter level 1

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

Tier Three
Requires Fighter Level 3 (4 for Weapon Group Specialization), 10 APs spent in tree

Tier Four
Requires Fighter Level 4 (8 for Weapon Group Specialization), 20 APs spent in tree

Tier Five
Requires Fighter Level 5 (although many prereqs require Fighter Level 8), Character Level 12, 30 APs spent in tree