Demon Guns: Bolverk

Arcus Diabolus: Bolverk is form of a pair of handguns. According to Continuum Shift, it can attack targets through walls, Optic Barrel being a dimensional collapse of sorts at a point in line with the barrel. Bolverk also serves as a limiter for Noel that suppress her emotions which explains why she does not become emotionally unstable as Carl Clover or Jin Kisaragi. It is also revealed that in Noel's past she was attacked by a monster and suddenly Bolverk appeared right before her. In Continuum Shift's True Ending, Noel's emotions broke Bolverk unleashing Mu. Bolverk is Odin, disguised in his human form.