Ancestor Boss Theme - Soul Knight Soundtrack

I notice that there's a fluctuation in the tempo if you let the music go on loop in game. Therefore, this version is not the "most correct" one, maybe the devs will release the cassette later without speed fluctuation.

Update: Echoes of Ruins - Floor 4 Boss Theme ...
Non-fluctuation version by ‪@watchmp100‬: Soul Knight OST Extended - Fourth bos...