All battle, battle adjacent, and battle intro themes from Octopath Traveler, Octopath Traveler II, and Octopath CotC.
This is currently a complete playlist at 90 songs.

All Octopath Traveler Battle Themes

Starmantle Part 2 OST

Songs to say “Hey! Fight me!” to

Octopath Traveler 2 Soundtrack

ASDSZ

メズマライザ Mesmerizerー Hatsune Miku 初音ミク・Kasane Teto重音テト

OCTOPATH TRAVELER II Original Soundtrack

Throné, the Thief

Castti, the Apothecary

Ochette, the Hunter

Main Theme (Night)

Octopath Traveler II (Main Theme)

Oresrush, Dried Up

Cait's Theme

Requiem for the Fallen

Victory Fanfare

Gloomy Grotto

Miitopia OST -  Battle (Black Sage)

Stardew Valley OST

Mines (Danger!)

Mines (Visitor To The Unknown)

OCTOPATH TRAVELER Original Soundtrack

8. Octopath Traveler OST - Tension

11. Octopath Traveler OST - Battle I

24. Octopath Traveler OST - Decisive Battle I

1. Octopath Traveler OST - Battle II

1. Octopath Traveler OST - Battle III

Fire Emblem Echoes: Shadows of Valentia Original Soundtrack

Sea Winds and Travelers

The Ark of Dawn

Twilight of the Gods

The Sacrifice and the Saint

March to Deliverance

Cait's Theme

INFINITE SHADOW 24