Artixerxes (Morgoth Bauglir)

Origins
Initially a Maiar of Melkor, the name Morgoth took before being evil. Artixerxes was one of his most loyal Maiar servants, helping him from defending the fortress of Utumno during the Years of the Trees.

Melkor never tried to turn Artixerxes into a Balrog like he did with his other Maiar, Gothmog. This is because he was spawned from the void like Ungoliant from the Music of the Ainur.

Building his strength
In 360 of the First Age, Artixerxes was discovered by the Feanorian Empire in a dungeon of Angband. Fearing for his safety, Artixerxes fled further down in the Dungeons of Angband.

Destruction of Angband
10 years later, Artixerxes reached his full strength and charged out of Angband, killing any Noldor of Feanor in his path. Then he crushed the volcanoes of Thangorodrim with only his bare hands.

Trivia
Artixerxes is based on Alduin from the Elder Scrolls 5: Skyrim. Artixerxes wants to destroy everything in his part.

He is very powerful, even powerful than Ancalagon the Black. This is shown when he devours the volcanoes of Thangorodrim using only his claws. He is also able to stand on top of it which means he is a very giant dragon like Ungoliant is to the spiders. It is unknown how powerful he actually is.

Artixerxes was as strong as Second Age Sauron with the One Ring.

Artixerxes was loyal to no one except his master Morgoth himself.