The other game that I recall fondly and have since found on eBay is the mostly impenetrable and seemingly unplayable oddity Demons, in which players are magicians who battle each other by way of conjuring demons. Much of the game is inspired by an actual magical grimoire The Lesser Key of Solomon or the Lemegeton, a medieval text that purports to contain the formula for calling forth demons. The rules contain a nice "Historical Notes" section and even offers players a text of the actual conjuration if they send a SASE to the game company. Actually trying to play the game was a different matter, but the game pieces and map are a pleasure to look at again.
What were some of your favorites?