General | Combat Stamina
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Siege Engineer (Combat) Source Ultimate Combat pg. 118 You are proficient with all siege weaponry. Prerequisites: Knowledge (engineering) 5 ranks or Profession (siege engineer) 5 ranks, proficiency with one siege engine. Benefit: You are considered to be proficient with all siege weapons. Also, when you are crew lead for a siege engine, you do not generate mishaps on the roll of a natural 1. Normal: Each siege engine is an exotic weapon. 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.

Siege Engineer (Combat)

Source Ultimate Combat pg. 118
You are proficient with all siege weaponry.

Prerequisites: Knowledge (engineering) 5 ranks or Profession (siege engineer) 5 ranks, proficiency with one siege engine.

Benefit: You are considered to be proficient with all siege weapons. Also, when you are crew lead for a siege engine, you do not generate mishaps on the roll of a natural 1.

Normal: Each siege engine is an exotic weapon.

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.

Archives of Nethys

Siege Engineer (Combat)

Combat Trick (from the Combat Stamina feat)