I've been messing around with the succubus glitch for years and i finally got to the crazy numbers area just a few days ago. I did a fair amount of succubus glitching (just to get 100% souls and then stopped) the fight with menace was completely normal and so was the ending, but when I re-started the file I was in the crazy number area.
The reason you die for no reason: the crazy number area is the clock tower, but with messed up graphics. The game loads you into one of the rooms that has spikes all over the place--but you can't see them! Luckily, I figured out the trick to it after 2-3 re-loads. The pink blocks are spikes, avoid them at all costs--as soon as the game loads, turn to bat and try to make it to the next room. Once you make it to a save room or warp room, you will be safe.
Here's where this post gets tl;dr
When you load the game (into crazy number area) you will probably have the abyss map showing, but your map cursor will be way off to the left. If you make it to the warp room and press up, your map will fix itself and you will be able to warp anywhere you want, and the graphics will be fixed.
If you make it to the save room in the clock-tower and save; then re-load: the game will load you into a different crazy number area (actually the dark chapel) and the map screen will be really messed up. There will only be a small section of dark grey rooms in the bottom left corner of the map screen. Again going to any warp room will fix the map and going to any new area will fix the graphics.
The only thing that will never fix itself is the back-ground music. There will never be any music unless you enter Yoko's room or Hammer's room--then that music will follow you everywhere in the castle...pretty cool, huh?