Arbitus

The Arbitus. The photographer who took this picture was found almost entirely immolated.

The Arbitus is the primary weapon of the Auditor. It is a longsword at a length of 3 feet, 7 inches and is comprised of an unknown black material and emanates a red glow, much like the Auditor himself. Notably, the sword is very minimalistic in its design and the Auditor refuses to answer why this is. Within the sword lies a piece of the Auditor’s soul, allowing him to summon it at will. This is possibly the first instance of Enmeshment in the entire Omniverse.