The Tomorrow With You

The Tomorrow With You is Disc 5, Track 17 on the Xenoblade2 Original Soundtrack. Its melody contains a motif from Elysium, in the Blue Sky. It plays in the cutscene when Rex convinces Pyra and Mythra to not be afraid of their power (resulting in Pneuma's awakening) at the Cliffs of Morytha, and during Pneuma's farewell to the party as they escape the World Tree.