Mammon rules Castle Erebus, one of the largest and grandest planet-sized palatial citadels in The Nine Hells – filled with the ArchDevil’s planet-sized treasure hoard. And appropriate defenses.

Mammon himself is perhaps mostly Incorporeal rather than scales-and-horns – nearly omniscient in Castle Erebus, the better to defend his unfathomable wealth.

Among the other ArchDevils, Mammon is long allied with Mephistopheles and Dispator. This trio often conspires against Baalzebub, Belial and Molech. Mammon especially despises Molech.