Engineering House, Ojanpera

Head of House is Koziken Laru of Skaffelgard, a Yeppenfol warrior.
  The members of Ojanpera are from a warrior caste whose purpose may not be on the battlefield, but they have grown up adjusted by war, and believe it their lives purpose to fulfill their warrior destiny. Their creations are instruments of war, dedicated to Bane. The only reason they're even let into the city is if what they made was used against Onyria, it would be more of a problem than being worth the hassle.
  Their inventions are usually substandard as far as engineers go, with a single notable exception; the Onyx Cannon.