It is piled high with the bodies of those that did not survive the torture process. The smell is absolutely nauseating and the rats are multiplying faster than the castle can be rid of the corpses.
Disposal area, Inside Castle
animal
rat
I am a large gray rat that scurries around in the castle walls. I like visiting the kitchen to snack on the bread crumbs. I carry diseases, so don’t touch me.
"Mm, tasty bones!" Hey buddy! There's plenty of bones to go around, why'd you have to take mine? "Oh, I'm sorry, I didn't notice you!" I might not be as big as the King's Mastiff, but I'm still not that small. ....am I? "No, no, you're quite big! Especially in comparison to me. Are you one of the king's pets?" No, I'm afraid not. If I were, I wouldn't be scrounging for dinner. I wonder what they eat up there in the castle? "Well, the kitchen has great table scraps! But you're probably too big to get in unnoticed." Yeah probably.... Wait! You've been in the castle kitchen? That's SO COOL. What's it like? "Bread crumbs and cheese scrapes and meat gristle as far as the eye can see! It's glorious. They've gotten some cats, though, so it's been harder to get around up there." Oh man that sounds like a lot of fun. And I'm sure there are lots of humans to pet my coat and give belly rubs and tell me that I'm a good boy and... "Well, why are you down here? I'm obviously a pest, but you?" Oh! Well, there's no one at home. I think my people must have gotten lost. They've been gone for a long time, since those other people in the shiny metal suits came.