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Rath was a demon in Tartarus.
The depicted subject bears the likeness of Rath from the DC Comics; however, the DCAU character was never named on-screen, or otherwise. The title of this article is conjecture based on the character's likeness.
Rath, along with his brothers Abnegazar and Ghast, are known as The Demons Three in DC comics. The Demons Three ruled the galaxy a billion years ago, and have often been summoned by and connected with Felix Faust.