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Greater Vital Strike (Combat)

Source PRPG Core Rulebook pg. 126
You can make a single attack that deals incredible damage.

Prerequisites: Improved Vital Strike, Vital Strike, base attack bonus +16.

Benefit: When you use the attack action, you can make one attack at your highest base attack bonus that deals additional damage. Roll the weapon's damage dice for the attack four times and add the results together before adding bonuses from Strength, weapon abilities (such as flaming), precision based damage, and other damage bonuses. These extra weapon damage dice are not multiplied on a critical hit, but are added to the total.

Combat Trick

Source Pathfinder Unchained pg. 122
When using the Vital Strike combat trick, you can spend 4 stamina points instead of 2 to reroll four damage dice.