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Dragon Roar (Combat)

Source Ultimate Combat pg. 98
The spirit of the dragon wells up inside you and bursts forth in a mighty roar.

Prerequisites: Str 15, Improved Unarmed Strike, Dragon Style, Stunning Fist, Acrobatics 8 ranks.

Benefit: You gain one additional Stunning Fist attempt per day. While using Dragon Style, as a standard action you can expend two Stunning Fist attempts to unleash a concussive roar in a 15-foot cone. Creatures caught in the cone take your unarmed strike damage and become shaken for 1d4 rounds. A successful Will save (DC 10 + 1/2 your character level + your Wis modifier) reduces the damage by half and prevents a target from being shaken.

Special: If you have the Elemental Fist feat (Advanced Player’s Guide 158), you can expend a daily use of that feat to deal your Elemental Fist damage to those caught in the cone. This damage is not halved even on a save.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 118
Instead of spending two uses of Stunning Fist to unleash a concussive roar, you can spend one use of Stunning Fist and 5 stamina points to do so.