Character: The smell of death surrounds me!
The Catacombs is the second set of levels in Diablo I, consisting of levels 5-8.
There are Shrines and Goat Shrines that give random magical effects or other enchantments, and barrels appear just like the Cathedral levels. Walls and doors are present, but some monsters can open the gates.
The interior is filled with dark corridors. The corridors have little open space, a somewhat maze-like layout and a very gloomy atmosphere. Stairs to the next level take the form of cylinder-shaped towers.
As with other level sets, the first level of the Catacombs, level 5, has a staircase up to town. The entrance is in a crypt-shaped building between the Cathedral entrance and the cows. Mousing over it says "DOWN TO CATACOMBS".
The Catacombs is involved in five singleplayer-only quests. Three to four of these quests will appear in a given single-player game.
The entrance to the Chamber of Bone level, for the singleplayer-only quest of the same name, is found on Level 6.
Magic Rock, Arkaine's Valor, and Halls of the Blind share a quest group, such that 2 of the 3 will appear in any given single-player game. Chamber of Bone is present in every single-player game. Zhar the Mad has a 2 in 3 chance of appearing, sharing a quest group with Black Mushroom and Anvil of Fury (both of which take place in the Caves).