Elidor Master Mechanician talent

A person with this talent is a natural gadgeteer, and has  advantage on INT (Investigation to figure out strange technological devices. He can also build gunpowder weapons, siege engines, crossbows, etc., in the way an Armourer builds ordinary weapons. A Master Mechanician can also build a trap more quickly; it takes him only half the time it takes a Mechanician, or a quarter of the time if he is assembling an existing trap in a new place (i.e., the trap was removed from one spot and then reassembled in identical fashion elsewhere). This talent must be learned from the Mechanicians’ Guild.

From VOL 2 - "Mechanical Engineering Made Simple"