User blog comment:Look-a-troopa/Miscellaneous Witches/@comment-16075172-20140929124628/@comment-1827303-20140929154846

I'm going with the multi-species thing as a parallel with the archdemons and the main crew. It'd also make more sense for the witches to be of alien descent, because at the time most native Ludusians were completely unfamiliar with magic (Which is why the only Gridmask included is half-Oumeth), while most other alien cultures were already well-versed in the concept.