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

Octopath Traveler: Champions of the Continent OST

Octopath Traveler

Game favorites

OCTOPATH TRAVELER  Champions Of The Continent –Main Theme–

Herminia, The Covetous Witch

Tytos, The Hero

Auguste, The Playwright

Guided Travelers

6.26 Underworldly Entity

Transcending All + Bestower of All

Obstacles

NieR Automata OST - Kainé Salvation Orchestral

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

15. Octopath Traveler OST - The One They Call the Witch

16. Octopath Traveler OST - Moment of Truth

17. Octopath Traveler OST - Daughter of the Dark God

Song of the Ancients  Fate

I own nothing. All rights go to Square Enix.

Octopath Traveler Arrangements (Break & Boost) - Daughter Of The Dark God (Boost)

Made by Toby Fox and Smash Bros Ultimate. I do not own this soundtrack.
EDIT: Thanks for these likes :)

Megalovania (Undertale) [New Remix] - Super Smash Bros. Ultimate Soundtrack(EXTENDED)

I don't always remix Megalovania but when I do, I make sure it's ePIC-

I told myself I wasn't gonna remix this since I technically had other plans for something Megalovania related in a few months, but with the Smash crossover being this month as well, I changed my mind and decided to try my take at these two themes (｢･ω･)｢

Art!: https://twitter.com/Lshirop3/status/1056106003438039040

[Undertale Remix] SharaX - Megalolight (Smash Bros Ultimate Megalovania x Lifelight)

Transcending All + Bestower of All

Michael Danielson