I do not own Phantasy Star Online or anything related to it. Everything to do with the series belongs to SEGA and Sonic Team, and I do not claim ownership of any of it. Played during the fight with Olga Flow's second phase.
Yeah, this is definitely the most epic song in the whole game. I remember getting to the second part of this battle after the first one with my cousin and when Olga Flow got up and this music played, we were both like "Oh shit..." lol.