|Appearance||Tales of Vesperia|
|Residences||Necropolis of Nostalgia|
|Occupation||Child of the Full Moon|
When the group visits the Necropolis of Nostalgia, located at the bottom of Zaude, they find the City of the Waning Moon, where the souls of the Children of the Full Moon who sacrificed their lives reside in a realm detached from time and the reality of the world above. Deeper within, they find the king of the Children of the Full Moon, Ohma, who claims to be imprisoned. Long ago, the Entelexeia and ancestors of the Children of the Full Moon worked together to seal Ohma away for 1,000 years due to a conflict among the Children of the Full Moon. He only managed to stay alive so long thanks to a drug known as amrita (アムリタ?), which caused adverse effects and transformed him into a mutated creature. He only continues to exist to sate his desire to destroy the Entelexeia and conquer the world.
Seeking revenge from those who imprisoned him, he flees, and the group pursues him. Upon finding him, they witness his transformation into his true form and face him in battle. After this, he flees farther underground, an area accessible only once the game has been beaten. In this new area, they encounter Ohma again, this time accompanied by a large, fearsome Entelexeia. Estelle pleads with Ohma, who remains intolerant to the group while he stands near the silent Entelexeia. The Fell Arms then appear, and Ohma claims that he was the one who forged them using powerful apatheia, given to him by the Entelexeia Spiral Draco, who looms nearby, observing the scene but not saying a word.
Ohma states that the Fell Arms were intended to be his way of killing those who betrayed him, and he then offers himself to Spiral Draco, allowing the beast to absorb his body with the ultimate intention of destroying the world.
Ohma has mutated white, multi-armed and multi-handed being with massive wings that are actually hands whose fingers are also hands. He is capable of firing beams of energy as well as controlling gravity.