Floor 25

You have entered the fiery pits of hell!

Floor 25 has large pools of water and lava. This is where you fight Baezl'bub. There are very large numbers of enemies. Baezl'bub himself is not that hard as long as you don't have to deal with the hordes of other monsters, so if you have fire resistance and can walk on water, fighting over lava will make things much easier for you. Don't forget to claim The Black Heart!