The Cinderroot Hollows

The ash-sealed dark beneath the Emberwaste, where the Cinder Quorum's grave-breakers dig the barrows the nomads refuse to touch — Forbidden-tier, a hollow furnace under an already-deadly surface country.

The Emberwaste buries its dead in ash the nomads won't disturb; the Cinderroot Hollows are where the Cinder Quorum digs anyway, hauling out whatever the drifts unseal to fence for coin, all loot and nerve and a bad name. The heat only gets worse going down, and the Hollows go down a long way.