Battle!!

Battle!! is Disc 1, Track 17 on the Xenoblade2 Original Soundtrack. The melody 39 seconds in is based on a part of You Will Know Our Names, and Battle!! (Piano Arrange) is an arrangement of the track for solo piano. The track plays during standard battles in the following areas of Xenoblade Chronicles 2:
 * Argentum
 * Gormott
 * Uraya
 * Mor Ardain (except for the Abandoned Factory)
 * Leftheria (not including the Spirit Crucible Elpys)
 * Indol
 * Temperantia
 * Tantal

It also plays during the following scripted battles:
 * The on Azurda's back.
 * The Lethal Lysaat King on the Ancient Ship.
 * The Wormeater Brog in Gormott.
 * Captain Padraig and the Ardainian Soldiers in Torigoth.
 * The Ardainian Soldier and Sergeant guarding Nia in the Titan Battleship.
 * The Rampaging Ardun in Uraya (when Rex learns to topple using Anchor Shot).
 * The Violent Driver in Fonsa Myma.
 * The Latollo Puffots in Gormott (owned by the children who stole Roc's Core Crystal).
 * The Tirkin Chefs in Indol.
 * The Tantalese Knights in Tantal's Hall of Mystery.
 * The Roiba Ignas in Boreas's Blade Quest, Hero of the Nopon.
 * The Nenz Rodonya and Zeld Rodonya in Godfrey's Blade Quest, Flames of Justice.
 * The Herridot Laia and King Laia in Herald's Blade Quest, The Calm and the Storm.
 * The first fight against the Skom Tirkin, Matchul Tirkin and Brius Tirkin in Kasandra's Blade Quest, Our Daily Bread.
 * The Ardainian Snides and the Ship-Eating Taos in Newt's Blade Quest, Newt Recruits.
 * The Tronk Aligo in Perun's Blade Quest, Eternal Spirit.
 * The Magno Blants and the Cherys Medooz in Theory and Praxis's second Blade Quest, Blade-Sharp Memory.
 * The first two fights against the Enraged Gogol and the Indignant Gogol in Wulfric's Blade Quest, Tender-Hearted Beast.
 * The fights against the Indoline Warrior Monks in T-elos's Blade Quest, Lingering Resentment.
 * The Aurora Garlus and Aura Garluses in Corvin's Blade Quest, Corvin's Approach.

Finally, it plays during the eating contest between and Boreas during the latter's Blade Quest.

The melody at 1:17 was adapted for Pyra and Mythra's victory theme in Super Smash Bros. Ultimate.