Nihal

Nihal, sometimes called the Serpent Star, was an Elder Evil from the Far Realm who had taken possession of one of the stars of Realmspace. Unlike normal stars, Nihal didn't have a fixed place in the sky but instead danced and wavered across the Realmspace.

Description
Nihal was a red star, although some stargarzers said that Nihal's light was green. Nihal was actually a tear in reality composed of an infinite swarming mass of maggots and worms.

History
Nihal, and the other Far Realm-infested stars of Realmspace, were somehow related to the Eldest.

Nihal writhed around the position it should hold in the sky, and because of that it was called the Serpent Star. Sometimes Nihal sent its agents to Toril, the Serpents of Nihal, to feed on living things so Nihal could sate its hunger. Some scholars believed Nihal was the brother of another elder evil, Kyuss, or even the same being observed from two different points in time.

Nihal was one of the stars the warlock Japheth Donard sought out in 1396 DR, after having lose his pact with the archfey Neifion.