Ancient Ocean of the Dreadnaught Gods: Poseidon (Lostbelt 5 Map Theme 2) [Fate/Grand Order OST]
FGO playlist -
Fate/Grand Order OST part IV, disc 1, track 20 - Ancient Ocean of the Dreadnaught Gods: Poseidon
[FGO Cosmos in the Lostbelt, Lostbelt 5.1 Atlantis, Map theme 2]
Composed and arranged by Keita Haga
I own nothing