Xenosaga Episode III Edit
It serves as the last Omega boss when defeating Dmitri Yuriev and the post-transformed Omega. It virtually transforms into a powerful and formidable machine when Dmitri merges with it, along with the waveforms of U-DO that had infected him from his time of having direct contact with the entity.
After Dmitri/Ω Metempsychosis is defeated by Jr. and company, Albedo appears. The Zohar and Abel are extracted from Ω Metempsychosis and transported to Michtam (although the cutscene depicts Albedo doing this, a later cutscene implies "someone's will" did, likely Wilhelm).
The name "Omega Metempsychosis" is translated as "Omega spirit transmigration".
- Like other mecha in the series, it is a recreation of a Xenogears design; in this case the Deus boss enemy from the end of the game. Where Deus sported two tiny angels, Omega Metempsychosis is accompanied by two lookalikes resembling Fei's Gear Weltall and Elly's Gear Vierge.
- According to the Episode III database, back at the time of Lost Jerusalem, an Omega machine was also created which nearly resembles Omega Metempsychosis, but was presumed to have been destroyed when Lost Jerusalem disappeared as a result from when the Zohar went out of control.