Level 4 is the fourth and the last Cathedral-style level in the original Diablo. The player(s) reaches Level 4 after descending a stairway in Level 3. Somewhere in Level 4 there is a stairway to Level 5 (not shown on the map if tavern sign was stolen, see Ogden's Sign).
It holds a glimpse of which monsters may cross the player(s) way in the Catacombs (e.g. Flesh Clan, Gloom), and the first demon types apart of Hidden (Flesh Clan).
