This is one of the strange old classics of fantasy. Ignore the first few pages -- they're a crappy little framing story, and Eddison quickly forgets about them altogether.

After that -- the grand struggle between Witchland and Demonland is a beautiful and subtle epic war, full of grandeur and subtlety.

It's a touch challenging to read, but absolutely worth your time.

H. G. Wells was one of the originators of science fiction. This is one of his minor works, but it's quite clear why Wells was such a master. Food of the Gods is by turns terrifying, insightful, and hilarious.