I don't know if this has been discussed when I was not here, but from what I have seen, not only is Myth majorly based on the Black Company series of books and contains elements from Lord of the Rings, It also seems to have elements from the Wheel of Time series. The main one that I know of is that, althought it must have only been metioned once as far as I have read, a character called Ishmael siad that there was always a champion of good ( there was a champion of evil too, but that wouldn't be right in the world of myth) and it is the rencaranted soul of one man. This would corespond with the A B spirit theory and would seem basicly correct. The minor, but more noticeable one, is that a creature called a Mydraal is also know as a Fetch, and is reluctant to cross water, which was a characteristic of the Shade.
-Aliksunder Turepath ( Formerly Obsidian the Prophet)