the OST you're hearing is the full song of the OST, but during the actual battle, in the last minute of the fight, there's a finale for the song different from the normal OST ending where the pianist enemy did a full arpeggio of this theme back-to-back with one hand! and accompanied with a full wipeout of your team if the finale was successful, with the conductor (Gregorius) bowing to you for the performance lol

This music improves, when you actually see how it works in gameplay.

Your character guess is VERY ACCURATE, synthetic clasical musical boss made for an experiment and embody immortality through art, has a sense of urgency cause he instakills you if you take too long, and then you guessing the style is just... Aaaaa i love blue archive. Btw, someone did play the piano live, look up blue archive gregorius piano cover, by Frost Piano

>Urgency Because if you don't finish the boss battle in time (End of the song, quite different in game), your whole team gets wiped 🤣

Okay I didnt expect BA to show up here

The piano of this piece was played by the composer, mitsukiyo himself. There's a corresponding video on X

Blue Archive has so many banger songs!

What's even better is that in the gameplay, once theusic ends, so does the life of your team. Its basically a wipe out even if you have timer remaining

"From break and ruin, the most beautiful performance begins."

Glad you catch the urgency because Gregorious is going to wipe out the team if you failed to defeat him before the song ends, and iirc it is shorter than usual raid timing

LORE: gregorious is a boss created by maestro in the old cathedral for experiment

Starting Pistol is also another very nice track from Blue Archive.

You say this is “Insane”? No, it's a “Torment”. (BA joke)

SENSEIS!!! ASSEMBLE!!!!

I hope you react to more BA OSTs! This game has so many bangers

You definitely got into the deep end to the latest boss theme lmao if you ever want to react to other Blue Archive bgms, Unwelcome School is most of the most popular one

How about ULTRAKILL music next? Tenebre Rosso Sangue maybe?

Damn, we're starting with that?

Random blue archive content 😂

Hey Atlas, if you're a lover of orchestra, if you ever get a chance or if you're ever interested i think there is a song you'd might like. Its called "The fear" from Dracula 2020. I think you'll really like it and loved to see your reaction to it

There is a video of someone playing this on youtube already.

Please check out the ost Praise of God of the show solo leveling

Try to react some BanG Dream! songs, sir