|Denizens||Pallid giant worms, mouldering shamblers, deformed fungoid dragons, demons|
|Description||Vast Underground Fungus Realm|
Jeharlu is the abyssal realm of the demon lord Cyth-V'sug, made up of a single writhing colony of parasitic fungus, that is much larger than a planet, suspended in a large cavern by white filaments. The Jeharlu can push its tendrils out into other planes to corrupt and draw them into itself. At its centre resides Cyth-V'sug, the Prince of the Blasted Heath.