a skeleton's kidneys?

The first floor of the keep   The entire first floor of the keep has been left in ruins. Piles of rubble and rotted, broken furniture are strewn everywhere. In the thick layer of dust pawprints of wolves, scuffs and scrapes from skeletons, and the footprints of rotting zombies can be seen. Along the walls can be seen the portraits of the Von Zarovich family, the rulers of Barovia for centuries past. The rampant neglect continues to the north, south and east. {Exits: north east south} ... You land a devastating strike to a skeleton's kidneys.