General | Combat Stamina
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Shaitan Earthblast (Combat)

Source Ultimate Combat pg. 117
With a forceful stomp you release a blast of acid from the earth to burn your enemies.

Prerequisites: Con 15, Wis 17, Elemental Fist, Improved Unarmed Strike, Shaitan Skin, Shaitan Style, base attack bonus +13 or monk level 11th.

Benefit: While using the Shaitan Style feat, as a standard action, you can spend two Elemental Fist (Advanced Player’s Guide 158) attempts to unleash a 20-foot column of acid that has a 5-foot radius and erupts from a point of origin within 30 feet of you. Creatures caught in the column take your unarmed strike damage plus the acid damage from your Elemental Fist and are staggered for 1 round. A successful Reflex save (DC 10 + 1/2 your character level + your Wis modifier) reduces the damage by half and prevents a target from being staggered.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 131
Instead of spending two uses of Elemental FistAPG to unleash a column of acid, you can spend one use of Elemental Fist and 2 stamina points.