Bombardier enhancements

Tier One
Alchemical Resistance, Alchemist Level 1

Tier Two
Requires Alchemist level 2, 5 APS spent in tree

Tier Three
Requires Alchemist level 3, 10 APS spent in tree

Tier Four
Requires Alchemist level 4, 20 APS spent in tree

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