No8=UN↑口and巨DIE

no8=UN↑口and巨DIE (called on the JASRAC database) is Disc 1, Track 8 on the XenobladeX Original Soundtrack (making it the eighth track in 0rCH-SUITE "X"). It is split into two parts; the first plays from the start until 2:28, and the second plays from then until the end. The second part of aBOreSSs is a remix of the second part of this track.

The first part of the track plays in the following cutscenes:
 * The party encounters Volkampf, the Pursuer in.
 * The party first encounters the Prone Scouts in.
 * Nagi notifies the BLADEs of the incoming Ganglion invasion in.
 * The party finds Mika's destroyed Skell during Rapid Misfire.
 * The party finds Jejebba during The Mad Monk.
 * Rock reveals that Celica went to Sylvalum to complete a mission by herself during New in New LA.
 * Ornella reveals her plan during A False Hope.
 * The party finds Leland Cole during Fathers and Sons.
 * Murderess learns about the bounty on Lan'cord during The Little Rich Girl. (If Murderess has won the bet against Yolanda, the track starts playing at the start of the cutscene instead.)
 * Mediators confront Murderess over a string of homicides at the start of Serial Thriller.
 * reveals that Nagi has gone missing at the start of Nagi's Time.
 * The party meets up with Frye in Bedrock Hold during Blitzkrieg (if the player chooses to protect NLA with Phog at the start of the mission).
 * Tatsu learns that his mamapon has been missing for three days during BFFs.
 * Yelv mistakens the Gale Milsaadi for his partner during Yelv's Partner.
 * Gus is defeated and killed by the Unruly Petramand if the player decides to abandon him during The Ultimate Price.
 * Gerome dies shortly after the party helps him during Murder Most Foul.

The second part plays in the following cutscenes: A short looped segment of the second part plays as the battle theme in the final waves of most Squad Missions and Support Missions, and the battle theme of the Time Attack Mission Twin Dolls of Mystery.
 * The Tainted Sphinx confronts the party in.
 * Doug shows up to help the party fight the Arrow Cinicula during Close Comrades.
 * Elma is notified that the Ganglion have recovered the Vita in.

Etymology
The no8= at the start of the track indicates that this is the 8th track on 0rCH-SUITE "X". Moreover:
 * The kanji 未 is a negation prefix in Japanese that functions similarly to the 'Un-' prefix in English.
 * 矢 is the kanji for 'arrow' (which the character ↑ references).
 * Combining 矢 and 口 into one character results in 知. Including 未 results in '未知' ('michi', 'unknown').
 * '巨' is pronounced 'kyo'. Combining it with 'DIE' results in 'kyodai' ('huge').

Putting these together (assuming 'and' is simply meant to join the two words and ignoring the 'no8=' at the start), the track's name decodes to 'michi kyodai' ('huge and unknown'). This aligns with its JASRAC title.