Xenoblade Chronicles 2 (2017 Video Game)
Torna ~ The Golden Country is a standalone expansion to Xenoblade Chronicles 2.
Mythra's costume as a Spirit in Ultimate is available in-game.
Mentioned in dialogue.
A Mii Costume is based on Rex. Rex, Pyra, Mythra, Nia, Tora, Poppi alpha, Mòrag and Zeke are spirits.