Lit only by scattered torches, The dungeon lies far underneath the castle.  Bandits and Thieves who find themselves there are met with cold stone walls and floors, with chains and bars restricting movement.  Guards patrol the corridors, keeping an eye out for any escape attempt or misdeed.  The only comforts afforded in the Dungeon are the piles of hay for sleeping.
Dungeon, Inside Castle
thief
rat
I am a rat I love to eat crumbs dropped on the floor. I love dark places and scurrying about the castle. The kitchen pantry has the best food.
I dont eat coins. Can you get me to kitchen if I do?  Only if you help me with a few jobs, Rat. You can use the low lighting and secret tunnels to your advantage. Maybe your ugly spider friend can help you distract the people while you take their valuables. The low lighting in this dungeon is perfect for the crime.  okay You are not the brightest Rat in the dungeon, but you will do.  Now go fetch me some gold! I will then give you a map to the kitchen.  Where is the gold?  Stupid, rodent. The people have it in their coin purses. Now bring me some gold and valuables! Keep an eye out for the guards!  Here is some gold. I saw a secret tunnel to the bar too.  You have proved me wrong, Rat. I did not think you would succeed. Can I get my way to the kitchen? Don't touch me, you dirty Rat. Here is your map. Only rat I've ever met who can't find a kitchen.  ungrateful thief Ungrateful? You have your map. Now get out of my sight you stinky rodent.  