The other problem is that the "shapeshifter bad guy" archetype is already taken in the series (ad yes, you can have more but to what end?) Naagloshii have clearly already done that well enough in the series, so what does Nemesis add that they do not?
they show a specific specialist ability true. But not the scope of what's possible.
we know thoughts of similarities create resonance. This is by and large one of the simplest things used in magic. Doesn't matter if it's blood, hair, a ken doll with some styling... Or thoughts.It's all about creating that channel to direct the magic through. What's used only effects the quality of the channel, not the magic behind the idea.
So say, I have Grey turn into someone, he acts just like them yea? Can be overcome by THEM if he loses himself. Can't I use him now as a channel to the real one? Can't I use the same principles to say,
give him a stomach ache, cause him pain or even control his very mind from a distance? Grey's just the conduit and actually doing anything to grey is just part of the mental ritual of focusing the magic. It's not needed.
Seems pretty superfluous cause if grey can turn into him we probably already have their blood huh?
Now, what if instead we just have similar thoughts? Can't I mold my thoughts to be more like theirs to create a deeper and more direct channel to them? All I'd need is the initial connection to start the process yea?
An that's how Nemesis operates. The advantage of having a non corporeal shapeshifting ability is resonant access things you become mentally. It's why It's so hard to detect, and probably why Molly was egged into using fear magic by Sandra the fishy name Marlin. Opened her to fear bringer.
(And I theorize why Harry having cat sith NOT be lethal automatically made him vulnerable to hwwbh, who I think prefers to play with his food)