oh man, The Final Boss Theme in travis strikes again is probably my favorite ktp song... uh, maybe not, but i really really like it a lot. the uvb-76 sample, the beginning being pretty much scratches and temtaptives of beats, until it takes shape and hits so hard with N.M.H sample... i just love, LOVE that song.

anyway, good list!

also shadowlord is great. i'm sad that replicant ver. sqrt 1,5 kind of messed it up a little (they added some weird castlevania organs at the beginning that made me think like "uh... why??").

https://youtu.be/niC4eGvOW7g check this shit out tho

groovy....

Bayonetta final boss is amazing.
Also, honorable mention but American Venom from RDR2 slaps like fucking crazy

So happy to see Fly in here... Best Yakuza boss tune ever!!

- FF6, FF7
- Pokemon Red/Blue, Gold/Silver
- Splatoon 1, 2 and Octo Expansion

nobuo uematsu hit his final boss prog peak with Howl of the Departed from Lost Odyssey

Sayonara Wild Hearts has a pretty great final level track https://youtu.be/wCcDm5ebLx8

damn i'm surprised there's no Undertale
KH1 and 2 go absolutely bonkers with their final boss tracks
The World Ends With You for its final boss fight does a remix of the main theme twister, but with the tonality of a live street performance and takes that shit to eleven, so I wholeheartedly recommend throwing that on here
a lot of shmups could've been nominated here so I'd recommend at least listening to ZeroRanger's
and finally, there's a distinct lack of OPEN YOUR HEART/LIVE AND LEARN here

Ketsui (NO REMORSE)
Final Fantasy VI/VII (Dancing Mad/One Winged Angel)
Darius Gaiden/G darius (SELF/ADAM)
Bloodborne (The first Hunter)
Fire Emblem Echoes (Twilight of the Gods)

Great list btw

Some real bangers on here!
"Fancy Meat Computer" ( https://youtu.be/lL6C3AQ9Fc4 ) from Hylics 2 stands out for being the only openly aggressive and heavy song in a soundtrack that's mostly laid-back prog rock.
Evergrace's soundtrack is already insane, but "Edge of the World" (https://youtu.be/eixa_TizUuc) is such a chaotic and overwhelming piece, fitting for such a strange game.

https://youtu.be/SMD5XJ1GrTU Dancing Mad but it's an
auroral magical girl edm opus that blasts while you fight an entropic god on the tennis court and every student you've befriended jumps in to boost your stats by bestowing plushies and makeup and cheers

Simply the greatest

thanks for the great suggestions everybody!!

Ys I & II Chronicles (Final Battle & Termination)
SMT Nocturne (specifically the final boss of the true demon ending route)
Rabi-Ribi (RFN I I I)
Exceed 3rd (Intersect Thunderbolt)
Suguri (Rendezvous)
Eschatos (Extermination)

- Mario & Luigi: Superstar Saga
- FE Gaiden
- NES's The Legend of Zelda (Ganon Dungeon is also the theme for Ganon himself)
- Paper Mario: The Thousand-Year Door
- Mother 3

Hellsinker (Segment 8 Lv3-4 Boss)
Sin and Punishment (Blood Infactor)
Mega Man Zero 3 and 4 (Cannonball and Falling Down, respectively)
Xenogears (One Who Bares Fangs at God)
Sonic 3 and Knuckles
Touhou 6: Embodiment of Scarlet Devil (Septette for the Dead Princess)
Cave Story (Last Battle)
Parasite Eve (U.B.)
Radio Zonde (The Moon Which Gaze at Fate)

Ristar's Greedy Game and G-Darius' Self/Adam gotta be here

Also not entirely a boss theme but Darius II/Sagaia on Genesis uses a single song for its entire last stage, and during the song's build-up, all of the sound effects are muted. They turn back on once the drop happens. It's also just a really spectacular song. https://youtu.be/_DkkcU5RCf8?t=1330

Add Lost Judgment

https://youtu.be/HcbR3TKN5Dc