Locate Weakness

Divination
Level: Artificer * 3, Bloodrager * 3, Hunter * 2, Inquisitor * 3, Magus * 3, Ranger * 2, Sorcerer */Wizard * 3, Warlock * 3
Components: V, S, M/DF (a pickled predator's eye)
Casting Time: 1 Standard Action
Range: personal
Target: you
Duration: 1 minute/level
Saving Throw: -
Spell Resistance: -

You can sense your foes' weak points, granting you greater damage with critical hits. Whenever you score a critical hit, roll the attack's damage dice (but not extra or precision damage dice) twice and take the highest result.