Crisis

Crisis is Disc 1, Track 8 on the Xenoblade Original Soundtrack. It plays during
 * The Mechon raid in Colony 9
 * The cutscene in which Xord escapes with Juju on the Bionis' Leg
 * The cutscene after Xord is defeated for the first time in the Ether Mine
 * The cutscene in which Melia, Aizel and Hogard fight the Telethia in Makna Forest before she meets Shulk and the others
 * The Mechon appearing in Eryth Sea
 * the Mechonis attacking the Bionis while Shulk and the others are at the Apocrypha Generator
 * The party's escape from the Mechonis Core to Junks
 * The Telethia attack in Colony 6 before Shulk's return
 * Otharon and Juju defending Colony 6 against the Telethia after the party reached the point of no return on Prison Island

It also plays in the following cutscenes in Xenoblade Chronicles: Future Connected:
 * The Armus in Gran Dell turn into Fogbeasts and attack the village's inhabitants
 * Fogbeasts from the outside break through the gates of Gran Dell
 * Tyrea gives orders to those defending Gran Dell as the party rushes off to Companion's Cape