The Sacrificed Ones

 is a track in Xenosaga Episode II. It has not been released on any soundtrack or sound selection and not much is known about this track. It plays in the following cutscenes:
 * Mary Godwin empathises with MOMO's personality layer being deactivated in the U.M.N. Control Center.
 * Shion learns of what happened to MOMO in the U.M.N. Control Center (Japanese audio only — in the English version of the game, the first note of in the beginning, there was... plays instead; this instance has a significantly different ending).
 * Helmer and Jin plan to extract the data stored with Canaan. (In the Japanese version, this instance also has the significantly different ending.)
 * Shion tells Allen that she is leaving for Old Miltia (Japanese audio only — in the English version of the game, no music plays in this cutscene; this instance also has the significantly different ending).
 * chaos muses on the Land of Mu as the Elsa lands on Old Miltia.
 * Jin tells MOMO about Joachim's final actions in Labyrinthos.

The Sacrificed Ones 2
 is a track in Xenosaga Episode II. It has not been released on any soundtrack or sound selection and not much is known about this track. It is a variation of The Sacrificed Ones with different instrumentation. It plays in the following cutscenes:
 * Shion departs from Allen in Vector's Second R&D Division (Japanese audio only — in the English version of the game, no music plays in this cutscene).
 * Jr. reveals that U-DO is an energy from a higher dimension in the U.M.N. Control Center.
 * Shion ends her conversation with Miyuki aboard the Dämmerung after seeing a brief vision of Nephilim.