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Two-Weapon Rend (Combat)

Source PRPG Core Rulebook pg. 136
Striking with both of your weapons simultaneously, you can use them to deliver devastating wounds.

Prerequisites: Dex 17, Double Slice, Improved Two-Weapon Fighting, Two-Weapon Fighting, base attack bonus +11.

Benefit: If you hit an opponent with both your primary hand and your off-hand weapon, you deal an additional 1d10 points of damage plus 1-1/2 times your Strength modifier. You can only deal this additional damage once each round.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 135
You can spend 5 stamina points to use this feat’s benefit a second time in a single round.

Mythic Two-Weapon Rend

Source Mythic Adventures pg. 76
Your synchronized dual attacks are even more dangerous, and can leave lasting wounds.

Prerequisites: Two-Weapon Rend.

Benefit: The damage of your Two-Weapon Rend increases to 2d8 points plus twice your Strength modifier. You can expend one use of mythic power to gain a bonus on this damage equal to twice your tier.