Tempest enhancements

Tier One
Requires Shield of Whirling Steel, Ranger level 1

Tier Two
Requires Ranger level 2, 5 APs spent in tree

Tier Three
Requires Ranger level 3, 10 APs Spent in Tree

Tier Four
Requires Ranger level 4, 20 APs spent in tree

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