- The hero, after arriving inside the crypt(src)

The entrance to the Demon Crypts
The Demon Crypts are the location where Na-Krul himself was summoned into Sanctuary in Diablo: Hellfire.
In-game[]
Polished black marble textures decorate this place of evil beauty. Demonic hieroglyphics and strange devices are carved into the walls and floor, and spiral columns support the ceiling. Lava runs under the floor, covered with grates. There is an orange underglow reflected off of the shiny marble surfaces. Tombs and statues are everywhere. This is the home of the demon nobility, and is populated with the dead, the decayed, and, of course, a myriad of demons. The barrels that appeared throughout the original game are replaced in the Demon Crypt levels with suitably gothic urns, sometimes containing lava. The level is very difficult, with many monsters crawling in its depths. Crypt levels have more cover than Hell, as they generate like Dungeon, there are also no Shrines or Bookcases, making it somewhat empty. Somewhere on Level 1, players can find the Cornerstone of the World.

The Monk in the Demon Crypts
As one descends through the crypts, the halls become progressively more crumbled and ruined as the source of the lava is approached. Finally, at the bottom level, players will encounter Na-Krul himself. Far more powerful than the other inhabitants of the game, Na-Krul can be weakened by using the hints contained in the Reconstructed Note to read the spell books found outside Na-Krul's realm.
Level Bestiary[]
The following monsters can be found in Crypt 1-4:
- Grave Digger (1)
- Devil Kin Brute (1-2)
- Satyr Lord (1-2)
- Tomb Rat (1-2)
- Firebat (1-2)
- Lich (1-2)
- Skullwing (1-2)
- Crypt Demon (2-3)
- Hellbat (3-4)
- Biclops (3-4)
- Flesh Thing (3-4)
- Reaper (3-4)
- Arch-Lich (3-4)
- Bone Demon (3-4)