This is the entrance to the underground sewers known as the Waterworks in my campaign that takes place in the city Stromreach on the planet of Eberron. This is the second part of the dungeon that players would enter from the Northeast of the map 'Waterworks Sewers Dungeon Entrance.' This map was filled with kobolds, ogres, and ended with a boss fight against a wight turned demilich in two phases. They could only access the center room by defeating the three ogres (ogre, ogre mage, zombie ogre) in the three rooms around the map. Be as creative as you would like with it though!