Mammon

Mammon is the foremost merchant and miser of the Nine Hells, and perhaps the richest entity in all the planes. As the lord of Minauros, Mammon oversees the soul trade. While those who pledge their souls are claimed by the devil they bargained with, lawful evil creatures that aren’t bound by any contract emerge from the River Styx as lemures. Roving bands of soul-mongers patrol the river’s banks, harvesting the newly created devils. On its arrival, each soul passes through the capital of Minauros, the Sinking City, and is recorded. The soul is then distributed to whoever should claim it, according to contracts in force and laws in effect. Mammon appropriates any extra lemures for himself and sells them for profit. Mammon has accumulated a great treasure hoard, but spends only a small portion of it on maintaining his domain. As a result, Minauros is a fetid, wretched place, its structures characterized by cheap construction, flimsy materials, and shoddy artisanship.

Everything Has a Price

Mammon measures everything in terms of its value in gold. He cares only for the material gain that a transaction can provide for him. He never rests, and spends every waking moment pursuing schemes to fatten his treasury. He looks for every opportunity to make his processes more efficient, so that he can rake in more and more gold in a given span of time.
Mammon’s obsession with wealth and efficiency make him a dangerous entity to entreat. He enters any bargain with the goal of making a profit. Those who waste his time or tarry in their dealings with him are likely to incur his wrath. If he can’t make an acceptable profit in return for the time he has spent, he can at least vent his frustration by grinding the offending party into a thick, bloody sludge.

Financier of the Hells

Mammon’s wealth is his primary way of exerting power and influence. He offers monetary loans to other devils in return for service, favors, or items he desires. From time to time, he dips into his coffers to attract mercenaries to ensure that a particularly virulent demonic advance is stopped — always in the expectation that the current lord of Avernus turns loot and booty obtained from the defeated demons over to him.
When they bargain with mortals, Mammon and his minions can offer irresistible wealth. Devils that are tasked with harvesting souls for Mammon carry with them The Accounting and Valuation of All Things, a manual that guides them in assessing the value of a soul in gold or other goods. The amount of gold that is needed to incite the greed of mortals is a minuscule drain on Mammon’s treasury, but the transactions that he and his followers consummate draw in more souls than the efforts of any other Lord of the Nine.

A Shabby Kingdom

The layer of Minauros teeters on the edge of ruin. The realm is a great swamp, interspersed with cities and fortresses that are in constant need of repair, upkeep, and replacement. Time and again, structures built on this layer are left untended and are eventually drawn into the bottomless muck of the swamp.
Mammon refuses to spend any more coin than necessary to keep the soul marketplace in the Sinking City functioning. Devils and fiends from across the planes gather here to trade souls. The place bustles with activity as caravans arrive and depart and merchants haggle over their wares. Buildings rest haphazardly atop the ruins of those that have sloughed into the muck. The roads are little more than huge stones sunk into the swamp, needing constant replacement as they slowly submerge until the mud consumes them.

The count of my coins is more reliable than any roster of mortal hearts or immortal souls.

— Mammon

Ruler of the 3rd Layer of Hell - Minauros

Aligned Organization

Lord's of the Nine