These ancient corridors are hidden beneath the Cathedral in the Rogue Monastery. The Catacombs have four levels: the first three are random. On the second level is a Waypoint. The Demon Queen Andariel, the Act Boss of Act I, can be found lurking in her throne room on the fourth level. The design of this last level is constant.
Catacombs are a very varied location where every level has different and exclusive monsters.
In Diablo II: Resurrected, the Catacombs can sometimes become terrorized. When this happens, the Cathedral also becomes terrorized. While the Cathedral is nothing special as a terror zone due to its small size and lack of monsters, the Catacombs is one of the best terror zones for item finding thanks to Andariel, who is always quest bugged and therefore has a much higher chance of dropping set and unique items. The fact that Andariel's dying causes all nearby monsters to die further increases the speed at which one can do Catacomb runs.
The Catacombs are considered one of the most popular terror zones by Blizzard, and therefore is terrorized often during the 22 Nights of Terror holiday event that occurs annually in December, on days designated "Winter Terrorland".
