Craftable set: Stuhn's Favor
(2 items) Adds 129 Weapon Damage
(2 items) Adds 129 Spell Damage
(3 items) Adds 1487 Physical Penetration
(3 items) Adds 1487 Spell Penetration
(4 items) Adds 129 Weapon Damage
(4 items) Adds 129 Spell Damage
(5 items) Increases your Physical and Spell Penetration by 13355 against Off-Balance enemies.
Shadow Disguise + Surprise Attack = sets opponents Off Balance, then Surprise attack does reduce your opponents resistances as well. I think it's over powered.