Makankosappo

Gazing into the meaty abyss, Seth felt a strange amusement at the befuddling sight before him. Within the Rat Kings chest, there was no rib cage for Seth to have to peer through or clamber past if he wanted to climb inside.

In fact, there were no bones in sight at all. Despite that, the chest had a cavernous opening within it that refused to collapse out of sheer spite instead of the rigid calcium that should be supporting it.

Not only were the bones missing, but the organs were too. There were no lungs, no kidney, no heart, there was barely any meat inside for Seth to slash apart as a distraction. It was like cracking open an egg and finding out the yolk was missing, and all he had was the useless shell. 

However, Seth's amusement at the situation did not stem from what was missing from inside the Rat King, but from what was there instead.