Avaritia

The 3rd layer of the seven hells, the layer of greed. This layer is an island, the lair of Fury, an infinite hoard of gold and precious items.

Geography

The third layer of the Seven Hells is one of the most well-known, as any greedy mercenaries know of the endless mountains of gold that forms this layer of the seven hells. Countless treasures were hoarded by the dragon queen of hell herself in this layer. The vast bulk of the hoard is an island made entirely of coins from across the millennia, including 10d10 × 100,000 gp, 20d10 × 200,000 ep, 30d10 × 300,000 sp, and 50d10 × 500,000 cp. Atop this island of coins are chalices, statues, and other objets d'art worth a total of 5d10 × 200 gp. A character can find a magic item in the hoard by spending 10 minutes searching and then making a successful DC 18 Intelligence (Investigation) check. A few examples of the hoarded items are: a mithral plate of fire resistance, a nine lives stealer, a rod of rulership, a staff of striking, and an ioun stone of mastery, and a portable hole. The portable hole appears to be a piece of heavy black fabric tied into a knot. Untying it and shaking it out causes an additional 5d10 × 1,000 gold pieces to fall out.
With the dragon queen's fiery breath, many coins melted, and now form mountains of molten gold, rivers of silver, and hills of electrum that make for a very particular and shiny landscape. The part that aren't covered in Fury's hoard are engulfed in infernal flames that burn the flesh of fury's enemy. The land is also dotted with golden statues representing mercenaries and adventurers, those statues are actually previous visitors that were encased in molten gold.

Features

Hazard

Avaritia's Curse. A curse linger in the air, threatening to affect creature who stumble through this layer. At the end of each long rest taken on the plane, a visitor must make a DC 10 Wisdom saving throw. On a failed save, the creature is cursed with the Curse of Insatiable Greed, which can’t be removed while the creature remains in Avaritia.
Fury's island. Among the mountains of gold, Fury's island stands the most in the most ostentatious way. The coins of her island red hot as the crackling flames heat them. A creature takes 5 (1d10) fire damage if it begins its turn on this island of red-hot metal.
Molten Gold Geyser. Infernal power sometimes condensate, metling portion of gold, and sending it flying into a burning geyser of molten metal. The gold fills a cylinder that is 50 feet tall with a 10-foot radius. Each creature in that area must succeed on a DC 12 Dexterity saving throw, taking 28 (8d6) fire damage on a failed save or half as much damage on a successful one. On a failed save, a creature is also encased in solid gold, granting it total cover, and is restrained until the casing is broken. The casing has AC 18, 50 hp, and is immune to poison and psychic damage.

Ruler

Fury rule over Avaritia, a dragon who used to be Asmodeus lover, and that now seek to destroy him. Fury turned this whole layer of hell into her lair, a giant hoard of infinite coins.
Fury lounges in her fiendish form upon a burning throne. This seat of fiery gold stands atop a mountain of treasure that forms a 120-foot radius island in an infernal sea of crackling flames.