The Clan of the Demons of Tempo-Katzooine was a remnant state of the Dark Legion after the First War of the Power, set by surviving demons who escaped the final defeats of the Dark Legion, taking refuge in the highlands and mountains west from Dol-Nur.
The demon clan will clash with the Order of Nortender, Amazon tribes and human-elven colonists, and later, with some other remnant states of the Polforian Dark Legion.
They will ultimately join forces with the Witch King of Dol-Nur before the Second War of the Power.
The Brotherhood will finally disband, but in the Reunited Dark Legion of the Second War of the Power, one of the provinces dependent of Dol-Nur will receive the name, in honor to the Demonic Clan that did so much to keep Polforia out of the hands of the humans and Grey elfs of the Five Kingdoms of the Northwest.