No10=CR17S19S8

no10=CR17S19S8 (called on the JASRAC database) is Disc 1, Track 10 on the XenobladeX Original Soundtrack (making it the tenth track in 0rCH-SUITE "X"). It is split into 3 parts; the first plays from the start until 2:26, the second plays from 2:26 until 4:34, and the third plays from 4:34 until the end.

The first part of the track plays in the following cutscenes:

Main story

 * The party encounters Glennar in.
 * Prone Skells surround the Ma-non in.
 * The Fierce Vigent appears during A Friend In Need.
 * Ganglion forces flee from the Tainted at the start of.
 * Elma and Irina plan their assault to save the Lifehold piece during.
 * The party sees Celica and Rock being confronted by the Ganglion during Manhunt.
 * Luxaar attempts to destroy the Lifehold Core's main control system after the Vita is defeated in.

Sidequests

 * Alexa throws away the sabotaged gun right before it explodes during What the Skell?!.
 * The party arrives at the base where Clarissa is being held captive during Bozé's Way.
 * The party reaches the Prone holding Clarissa captive in the same mission.
 * Stalio reveals herself (or, if the party helps Jejebba during The Mad Monk, is forcibly revealed) during Bozé's Ignorance.
 * The party, along with Doug's team, receives Irina's distress call during We Were Soldiers.
 * The party encounters the Intimidator Simius during the same mission.
 * The party searches for Irina after defeating the Intimidator Simius during the same mission.
 * The party finds that the Ganglion have been digging up data probes during Foggy Dilemma.
 * The party finds Koko attempting to tell off the Agile Caecus during BFFs.
 * The Grudge Tersqual attempts to eat Tatsu during To Serve Nopon.
 * TP351: Tempera appears during Frontier Spirit.

The second part plays in the following cutscenes:
 * Irina recognises the two BLADEs that need saving during Renewed Will.
 * The BLADEs fly towards the Lifehold Core in.
 * Celica flees from the Dimnet Xiphias after collecting the Selenean Sage alone during New in New LA.

The third part plays during the battle against Goetia in. It also plays in fights against the following enemies: Finally, it plays as the battle theme of the majority of Squad Missions and Support Missions for all but the final wave of enemies. (In Caravan Crisis, Supply Run, and The Giant Beast Strikes, it plays for the final wave as well.)
 * Dadaan, the Strongest Prone
 * Lugalbanda, the Wanderer-King
 * Vortice, the Deific Blast
 * Nahum, the Red Hare and Nardacyon, the Shadowless
 * Pharsis, the Everqueen
 * The Ajoa Cantor during Lakeside Getaway
 * The Gale Milsaadi during Yelv's Partner

Etymology
The no10= at the start of the track indicates that this is the 10th track on 0rCH-SUITE "X". Moreover: Putting these together with the 'CR' and 'S' in the title results in 'CR i shi S', or 'Crisis'. The significance of '19S8' is unknown.
 * The first syllable of the number one in Japanese is 'i' (from 'ichi').
 * The first syllable of the number seven in Japanese is 'shi' (from 'shichi').