Level 1 : Poison Weapon
Buffs Damage to Weapon Attacks
Level 2 : Shiv
Shiv is a sneak attack that does massive damage, causes bleeding and impairs movement.
Level 4 : Expose Weakness
A strike that exposes weak points for a brief time if successful.
Level 7 : Trip
Damage = 1-3, On Hit Debuff Target, Knock Target Down, +50% Faster, -4 To-Hit
Level 10 : Assassinate
Assassinate does massive damage, but it is easy to defend against.