Trails in the Sky the 3rd - Star Door 5 Boss: Richard (Nightmare Mode) 

Playlist: • Trails in the Sky the ...
Fight: 0:09
Difficulties apply to doors and this particular door is import since it gives Jinu, a super strong weapon for Anelace that can be upgraded by doing the Nightmare Arena (it probably won't be upgraded cause the Nightmare Arena is already pretty brutal with a good party). Even without the upgrades, its stats are insanely good for this point in the game and its the reason why I use Anelace in the next few bosses.