It is possible that the Hill of Gold quest (not HoG, please) came from the
elves, but it is well known from ancient Dara Happa and pretty-old Imther.
As for the Broken Council guidebook, the spelling of Elmal(us) (sorry, can't
find the reference right now) is easily explained as a result of Dara Happan
spelling conventions. --warning: new and not-universally-available
information use ahead-- The Entekosiad shows us how the Dara Happans spelled
or misspelled foreign gods' names, like Uleria for one.
As David Cake points out, the connection between the names Yelm and Yelmalio
is too much for coincidence. That's why I argue (with Sandy's support, but
then again he doesn't believe Elmal exists today) that Yelmalio has been
around in Southern Peloria a long while.
Just thought I'd ride into town long enough to share that with y'all. <very
big smiley face with fangs>