Omega (XS3 music)

 is a track in Xenosaga Episode III. It has not been released on any soundtrack or sound selection and not much is known about this track.

It does not play in Xenosaga Episode III. A version with no vocals, unofficially referred to as , plays in the following cutscenes:
 * Omega Res Novae is brought out at the C.A.T. Testing Grounds.
 * KOS-MOS engages combat against Omega Res Novae.
 * Omega Res Novae goes berserk after 's mental state becomes unstable.
 * The party looks upon Abel's Ark after Yuriev awakens the within it.
 * Kevin and Wilhelm discuss Yuriev's plans after the latter awakens the Zohar.

omega2
 is a track in Xenosaga Episode III. It has not been released on any soundtrack or sound selection and not much is known about this track. It is a version of omega with additional instrumentation.

It plays when Abel's Ark transforms as Yuriev uses the within it.