Second thought: I do NOT think this faction should go in Magitech. Actually, Omega, you're making factions that don't fit in any existing tech trees at all (Military, now Underworld). The reason this cannot go in Magitech is that it is not of the same time period (Tech, Magic, [kind of Dark Magic], ?Underworld?)
I know, of course, that you are going to argue that it does fit, but, in all honesty, it doesn't.