Heart in the Fog

Heart in the Fog is Disc 5, Track 9 on the Xenoblade2 Original Soundtrack. It plays in the following cutscenes:
 * The party collects themselves after being swallowed by the Urayan Titan.
 * Nia notices Pyra has left the inn in Fonsa Myma.
 * Nia consumes her 'sister's' flesh and becomes a Flesh Eater, followed by her father's death and Dromarch's awakening (flashback).
 * Jin reveals the Blades that died in the process of becoming Titans in the Tornan Titan's matrix.
 * Rex sees a vision of Nia hating him for not noticing her in favour of Pyra.