I don't know where they were thought from either, probably original. Though Eidolon sounds like it was from somewhere else, as with most of the other bosses in H2. I mean, the names of the four horsemen weren't certainly original. Where's John Romero when you need him <!-- s:P --><img src="{SMILIES_PATH}/icon_razz.gif" alt=":P" title="Razz" /><!-- s:P -->
I want more Serpent riders, not big demon things that get huge (oh gee, that guy could squash a serpent, how could he ride it)
I know Hexen is a German word for magic however.
I'll ask John Romero where it comes from, he's produced Heretic and Hexen, he should have the answer <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) -->