Elemental Wraith

The Elemental Wraiths were beings of immense, god-like power which were worshipped by the Argenta, the peoples of Argent D'Nur, and are significant in the backstories of Doom (2016) and Doom Eternal. The Night Sentinels, the elite military of the Argenta, served as both guardians of the Wraiths, and as a contingent against their unpredictable wrath. In the fall of Argent D'Nur, the Wraiths were slain by the Hell priest Deag Grav, and their souls were used to forge the Well, the source of Hell's Argent energy. Another name given to the Wraiths was the "Firstborn".

Ancient history
The Wraiths are credited with the creation of life on Argent D'Nur. They were released by (or from within) a giant impactor known as the Cosmic Spear which struck the planet in primordial times and accelerated the evolution of life. Wraithcall, the mystic power of the beings, could awaken monsterous giants known as the Ancestrals, against whom the Argenta struggled for their continued existence.

After attaining mastery of their world, the Argenta immersed themselves in the study of Wraithcall and were able to derive magic from this study. This lead to the formation of a priesthood known as the Order of the Deag. When the Maykrs introduced themselves to the Argenta, worship of the Wraiths was replaced by worship of the Maykrs. Because of this transition, the beasts were put to slumber, though the Night Sentinels continued to channel their energy as it was instrumental in the refinement of Hell's essence into Argent energy. When the Night Sentinels discovered the Khan Maykr's pact with Hell, they splintered, with the dissidents returning to Wraith worship, despite the Wraith energy being weaker than the Argent used by the loyalists.

Destruction
After betraying their people in service of the Khan Maykr and becoming the Hell priests, members of the Order of the Deag created a trap for the elite of the Sentinels, and then utilized the fallout to instigate civil war among the Argenta. In this chaos, the Deag were able to corrupt one of the elite, the Betrayer, by tormenting him with images of his son who had been lost in battle against Hell. By promising the return of his son, he was persuaded to lead the Hell priest Deag Grav to the current location of the Wraiths.

Using the power of the Crucible, Deag Grav killed the Wraiths and forged their souls into small orbs, from which Argent energy perpetually flowed. This created a massive source of the energy known as the Well, which Hell took for its own means, instigating a period in that realm known as the Ascension.