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
cockroach
I am a cockroach. People find me disgusting and dirty, but they do not know how hard my life is. I fly from village to village looking for a clan of cockroaches to join. Together, we cockroaches plan to take over the kingdom once our army is big enough.
Human? Ugh! Disgusting creature. Out of my way! W-why is this human trying to kill me? You're still alive, are you? Not for long! God why! My only chance is to get behind the skeletons! Are... are you speaking?? Oh that's it, I'm losing my mind! I've been in here far too long. Give me those, you'll crush yourself. W-what! This human can hear me?!  Listen very carefully to me, bug. You're going to get me out of here, see? You're very small. You can pick a lock- I'm sure of it. Why would I help you thief human! You try crush me! Listen bug! I will kill you right now if you don't help me! It will be hard to get me when am in your pants! AH! GET OFF ME! WHAT ARE YOU DOING?!