Zalmoxis, The Vanishing God is one of those books that you see and your inhibitions about adding yet another superfluous title to your library wilt before it. The title alone makes it a keeper. But, too bad, this is barely for the laymen, a dense, citation packed exploration of various aspects of Eastern European religion. Zalmoxis himself, a cave-bound god of immortality, is only the first chapter. Other topics covered here include Dacian wolf cults (my favorite chapter) and the wolf as a symbol, origins of the myth of the "creation dive", ritual hunts, Romanian folk ballads involving construction sacrifice, mandrake, and another folk ballad about a prophetic sheep.
All-in-all it sounds endless fascinating and at times it is. Eliade even goes above and beyond his focus on mostly non-Slavic Eastern Europe and looks at how many myths and legends have ancient, primal roots, since they're shared in places as far-flung as North America and India. This is a search for the imaginary universes of ancient men and women, not such much comparative religious study.
Still, though, it is jampacked with references and quotes and such, and can often be little more than stifling lists of things with breaks the mood of the work. Eliade is at his best when he's describing crazy, wacky mythical stuff.