Majesty

Majesty is Disc 2, Track 16 on the Xenoblade Original Soundtrack. It plays during these cutscenes:
 * Shulk and Reyn reaching Kneecap Hill in the Tephra Cave area, looking at Mechonis
 * The Monado III receiving the power to kill gods and Zanza's last words after the final boss battle at Sentient Genesis in Memory Space

It also plays in the following cutscenes in Xenoblade Chronicles: Future Connected:
 * The Monado III receiving the power to kill gods and Zanza's last words after the final boss battle at Sentient Genesis in Memory Space (flashback)
 * The Fog King initially loses power before reattacking at the Imperial Villa in Alcamoth