A creature known as an arch-alicorn, he has four wings instead of two, and is absolutely brimming with cosmic power. Thankfully for the creatures of the living world, his jurisdiction is only in the Underworld, keeping its citizens and the two cities in check.
Although the judge may seem unyielding and cruel, passing down harsh sentences, he still has a soft spot. If somepony were to make a strong case, he may stay his hoof. Maybe.