The Kar-Chee Reign — Avram Davidson

Earth is flat, empty, weary, and bare.

Her children, too, had left her, all but a few who lived peacefully off the land. And then came the Kar-Chee, to crack Earth open and suck out what remained of her richness, threatening the twilight of th old planet with an evil beyond anything that had gone before. With them they brought their servants, beasts so creul and horrible that men could recall their like only from ancestral nightmares, and named them “Dragons . . .”