Oh... At last, I managed to play this custom race without the game crashing or other issues.
Played as Vampires, like them but hey - forced unit owner change is not a good way to showcase "vampire hunger", IMO? Maybe making them weaker or receiving additional DMG could be tricker than... Killing your own units thus wasting resources into nothingness.
Overall thematic is kinda cool and smooth - I like that horror story vibe and bonus point for you for using Drustvar stitched creatures as Warcraft example of this race. Maybe adding more witches or even drusts could inspire you to create another tech tree for this race?
Recommend this race to anyone who wants to play 2 different techtress, feel horror and undead vibes without Arthas or Nerzul, and fans of Vampire: The Masquerade.
Like.