It's like the Time Chamber only you don't go insane and you can't die when you're in it.

First 99 floors

Hell Prides

100th Floor Boss:

Vante

Vante: I'm no pushover...

199 floors

Hell Vanguards

200th floor Boss:

Nero

299 floors

Abyss

300th floor Boss:

V

V: You put your inferior over your son? Tsk tsk tsk that's bold my better self.

399 Floors:

Hell Antenora

400th Floor Boss:

Nelo Angelo

Angelo: Death is but an illusion....

499 Floors:

Baphomet

500th Floor Boss:

Soundwave and his Cassettes

Soundwave: Your cries and screams...will become music to my audio receptors...

599 Floors:

Vehicon Troopers

600th Floor Boss:

Quantum Ranger

Quantum Ranger: I'm not just any ranger! Not by a longshot.

699 Floors:

Seekers

Thought it would be easy did you?

700th Floor Boss:

Dante

Dante: Took you long enough. Take the scenic route or something?

799 Floors:

Scudo Angelo

800th Floor Boss:

Dominic

Dominic: So...*chair screeches against the Qliphoth* You've finally arrived...

Secret Final Bosses:

Alucard

Shin Kurosaki Suya

Dracula

Kurosaki: We call ourselves a triple threat.*wink*