It would be better if you buffed some zombies or archers.
They are weak on their own, of course, but considering their importance in eliminating archers, as well as the presence of ghosts with incorporeality and protection from projectiles, and the ability to raise a large number of archers through necromancy, along with a significant buff when taking Blood Bond, it becomes clear that skeleton archers are very strong for breaking through enemy lines.
Buffing zombies would turn an already strong Orson into a mega-strong Orson, although zombies are weak on their own.
In any case, the focus of the mod is on levels 6-7 for Necromancer, not skeletons or zombies.