Sentence:  Think of wandering amid sepulchral ruins, of stumbling over the bones of the dead, of encountering what I cannot describe,—the horror of being among those who are neither the living or the dead;—those dark and shadowless things that sport themselves with the reliques of the dead, and feast and love amid <WSD>corruption</WSD>,—ghastly, mocking, and terrific. 
Meaning of the word marked with <WSD> tags:  The product of corruption; putrid matter.