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Penetrating Strike (Combat)

Source PRPG Core Rulebook pg. 131
Your attacks are capable of penetrating the defenses of some creatures.

Prerequisites: Weapon Focus, base attack bonus +1, 12th-level fighter, proficiency with weapon.

Benefit: Your attacks with weapons selected with Weapon Focus ignore up to 5 points of damage reduction. This feat does not apply to damage reduction without a type (such as DR 10/—).

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 128
Whenever you deal damage to a creature with damage reduction using the selected weapons, you can spend 5 stamina points to allow all your allies (other than yourself ) within 30 feet of the creature to ignore 5 points of the creature’s damage reduction for 1 round. This has no effect on creatures with damage reduction without a type (such as DR 10/—). This effect does not stack with Penetrating Strike’s normal effect, but it does allow you to apply the effect to all your other weapons for the duration.

Mythic Penetrating Strike

Source Mythic Adventures pg. 70
You know just how to strike to bypass even the most heavily armored foe’s defenses.

Prerequisites: Penetrating Strike.

Benefit: When using Penetrating Strike or Greater Penetrating Strike, you can ignore an additional point of damage reduction for every 3 tiers you posses. Additionally, the effects apply to damage reduction without a type (such as DR 10/—).