Thultanthar

Thultanthar, translated as 'Shade', in the Loross language, also known as the Shade Enclave, was a Netherese flying city, created in the year -1471 DR, some 1483 years after Ioulaum created the first such floating city. Thultanthars high mage known only as Lord Shadow had been experimenting with the Plane of Shadow for some time and had successfully shifted the entire city into the Plane of Shadow mere days before Karsus cast Karsus's Avatar and temporarily destroyed the Weave in the Year of Sundered Webs (-339 DR). For some reason though, Lord Shadow could not move the city back to the Prime Material Plane. It took weeks but eventually, they managed to return to Netheril, or at least what was left of it. Searching for survivors for days, the city floated over the ruins of the Netherese empire. Finding none, Lord Shadow assumed it was the work of the Phaerimm and began planning his revenge. He stopped though, when he realised that one city was not a match for them and that his subjects were likely the last of the empires people. He abandoned those plans and retreated back into the Plane of Shadow, vowing that one day, they would return and reestablish the empire. The city's clerics of Shar cast divinations and saw what had really happened, but only informed the noble families, presumably on the whim of Shar herself for some reason. The excursion into the Plane of Shadow, due to unforseen circumstances has lasted much longer than Lord Shadow anticipated. So for over 1700 years, the inhabitants have battled the Malaugrym and the other shadowy horrors of the realm, while each generation became gradually more attuned to the plane itself, becoming what are now known as Shadovar.

In the Year of Wild magic (1372 DR), Thultanthar returned to Faerun after the elf Galaeron Nihmedu finished a spell to bring Shade back to Toril where the shadovar found themselves floating over the Dire Wood. Almost immediately, the princes of Thultanthar (now known more commonly by its translated name of Shade) have been busy looking for Netherese ruins and artifacts as well as spying on people and places that could possibly hinder their ultimate goal of creating a new Netheril in their image.

Telamont Tanthul and the Princes of Shade
Shade is ruled by the Most High Telamont Tanthul, a powerful Shadovar archmage/Netherese arcanist of the Shadow Weave. Telamont is actually the original Lord Shadow who was alive in the time of Netheril. He has kept himself alive this long through powerful magic but may resort to lichdom at some point. One day he intends to inform the Shadovar of his true identity to inspire them all to victory.

He returned to Toril with his twelve sons, the Princes of Shade, all potent warriors and Shadow Weave spellcasters.