Seriously, there is a room 2.
Room 11 - The Sewer System
The 5'x5' grate from room 10 drops 10' down to the surface of the water in a 150' long segment of a stream that is 15' deep. The ceiling at the north end rises 20' and the water rushes out of 1-6" tall caracks in the rocks near it. At the south end the ceiling also rises to 20' (albeit with no water causing the extra height) , while at the water level there are two large rocks and many small ones that provide some protection before one is rushed over the 100' tall water fall (to room 300 below). There is faint glow provided from an edible lichen on the ceiling that is home to a variety of moths and a plethora of bats. There are a scattering of carp in the stream ranging from a few inches to a few feet that often manage to hide various rock formations on the bottom of the stream, hide from the very angry giant crocodile that feeds on them. There are normal sized cray fish and snails providing sustenance to both the crocodile and carp (in addition to the occasional bat death and their guano). An underwater search of the stream near the middle will reveal that a Black Dragon Wyrmling once tried to hide in some of the rocks as the front half is stuck in between some. The back half is missing and and the fleshy inside meat has been either eaten by the carp or washed out.
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I really need to start these earlier in the day or do the big rooms a bit over several days or give less detail, but in any case, I swear there will be a room #2.
Room 41 - Eleandra's Bedroom
The doors to the 20'x20' room are barred from the inside if the room is occupied (2am-6am meditating, 20% chance at other times unless Eleandra has already been met). It is hard to break in (DC 25 Str) but easy to pick through the very thin crack in the door from the outside. However the several small bells resting on the bar are pretty much impossible to non-magically stop from falling off unless some sort of clarivoyance is used to see that they are there. There is a large canopied bed against the opposite wall, the south wall has a wardrobe and a weapons rack. The north wall has a small stand with a chamber pot inside of it and a writing desk with a chair. Right in front of the door is a large rug with a very valuable chest in the middle.
By rights the chest should be a mimic but it isn't. It's empty, but touching it will send the rug of smothering beneath it and the flying sword and halbred on the weapons rack into action. (The Halbred is as flyigng sword, but has AC 18, HP 25, and does d10+1 damage). The bow on the weapons rack is magical (+1) but not animated with 10 arrows. They will also attack anyone breaking into the room while Eleandra is there.
The wardrobe actually contains a variety of fine elvish clothes. The stand and chamber pot are what they seem, as is the chair. The desk with paper and pen, paper with elvish writing describing what can be found below (pure fiction) is actually the mimic.
The bed is very comfortable and the Drow Mage Eleandra who provides protection to the nearby denizens is quite fond of it. She is also quite fond of living. She wears a ring that causes the wearer to have the false appearance of an older high elf (similar to disguise self, but on her it only change the colorations, so the DC to tell is 22). The ring also gives disadvantage on insight checks against her when she's lying and advantage when she's telling the truth. (Consider asking what the two rolled numbers were in order and not saying if they were with advantage, disadvantage, or neither).
After she apologizes for her defense mechanisms attacking the party, she will happily tell them about the nearby rooms and how to defeat them (not really) and that she survives by doing just enough magic for the surrounding folks to make them not gang up on her. If the party is heading out to the surface world she would love to finally get out of here (or so she says - she would also like to help take down the party if the occasion arises).
The next room created (#42) is in post #211:
D&D General - #Dungeon23 .