I think that the the title "tree of knowledge" also refers to the
Norse myth about
Yggdrasil, spelled in a variety of ways, the tree of knowledge was geographically as well as mentally and spiritually at a higher plane then the realms of the
high elves and
dark elves.
Amtgard, is said to have been derived from the Norse Myth of the Isengard, also sometimes called Ausgard, Ausgart, etc. Isengard is, the guarding level between the dark elves and the high elves and the high elves are the followers of the tree of knowledge or as it is sometimes called the tree of life.