Assassin enhancements

Tier One
Requires Knife in the Darkness, Rogue Level 1

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

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

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

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