General | Combat Stamina
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Siege Gunner (Combat) Source Ultimate Combat pg. 118 Aiming outsized siege weapons poses little difficulty for you. Prerequisites: Siege Engineer, Profession (siege engineer) 5 ranks. Benefit: You take no size penalty for aiming a direct-fire siege weapon larger than yourself. If you operate an indirect-fire siege weapon and miss, you misdirect fire by 1 square per range increment. Normal: Direct-fire weapons impose a –2 attack roll penalty per size category by which the weapon is larger than the creature aiming it. An indirect-fire weapon that misses misdirects fire by 1d4 squares per range increment. Combat Trick (from the Combat Stamina feat) Source Pathfinder Unchained pg. 131 As long as you have at least 1 stamina point in your stamina pool, you gain a +1 bonus on attack rolls with all siege weapons you are proficient with.

Siege Gunner (Combat)

Source Ultimate Combat pg. 118
Aiming outsized siege weapons poses little difficulty for you.

Prerequisites: Siege Engineer, Profession (siege engineer) 5 ranks.

Benefit: You take no size penalty for aiming a direct-fire siege weapon larger than yourself. If you operate an indirect-fire siege weapon and miss, you misdirect fire by 1 square per range increment.

Normal: Direct-fire weapons impose a –2 attack roll penalty per size category by which the weapon is larger than the creature aiming it. An indirect-fire weapon that misses misdirects fire by 1d4 squares per range increment.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 131
As long as you have at least 1 stamina point in your stamina pool, you gain a +1 bonus on attack rolls with all siege weapons you are proficient with.

Archives of Nethys

Siege Gunner (Combat)

Combat Trick (from the Combat Stamina feat)