Siege Engineer

Combat

You are proficient with all siege weaponry.

Prerequisite: 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.

Source: Ultimate Combat