Rending Claws

Rending Claws (Combat)
Your claw attacks do greater harm to your enemy.
Prerequisites: two claw natural weapon attacks, base attack bonus +6.
Benefit: If you hit a creature with two claw attacks in the same turn, the second claw attack deals an additional 1d6 points of damage. This damage is precision damage and is not multiplied on a critical hit. You can use this feat once per round.

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(Improved Critical): Your rend is not considered precision damage and is multiplied on a critical hit.