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Eldritch Claws (Combat)

Source Advanced Player's Guide pg. 158
Who needs magic weapons? Eldritch tricks are no match for your bestial ferocity.

Prerequisites: Str 15, natural weapons, base attack bonus +6.

Benefit: You natural weapons are considered both magic and silver for purpose of overcoming damage reduction.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 119
As long as you have 1 stamina point in your stamina pool, your claws are also considered to be cold iron weapons for the purpose of overcoming damage reduction.