They're so done, lmao. Years of preparation, just to get killed after your entire plan turned out successful.
these morons were trying to invoke a Maxim 47 situation and DIDNT consider that either they get a ready to conquer territory being actively policed by a wrathful demigod, or a completely worthless cratered moonscape.
Remember folks, Maxim 29: The enemy of my enemy is my enemy's enemy, no more, no less. Just because she destroyed Ziljan doesnt mean shes an ally.
Were true ancestors a thing before Tsukihime?
well, Type-Moon stole the concept from Vampire: The Masquerade which started in 91, dunno if theres lineage to before that, but thats the earliest i know of that Vampires get weaker the more distant the relation to the person who first became a vampire was.