There have been hints that when Kyven truly masters illusions he would be able to make changes to reality itself. I wonder if Kyven's scent gives us a hint as to what the Shadow Fox Spirit has really done to him.Clover, other Arcans, and animals all smelled him to be what he appeared to be, right now as an Arcan, but monsters smelled him entirely differently.
What if the amulet that Kyven wears does not in fact allow him to exchange a part of his humanity with Danna but solely locks them to a false duality? Kyven is the most adept of the Shadow Fox Spirit's new children and to monsters he smells of something different; not arcan, when holding that form, and not human. Yet, as in the quote above, he smells of and appears to be exactly what he looks like to everyone else. One of the skills he has inherited with his other shadow powers is the ability to change his shape to any he can imagine, stretching and reshaping himself at will by bringing the shadows from within his core and accepting his physical body into them. What if his base state is shadow itself? The human and arcan shapes would then be only limits imposed by his own mind. Could Kyven, and the other new children, take on any shape they could accept and fool reality for any non-monster? Or be limited to human or arcan (or fox) shapes but can change between them at will?
What if the amulet is a lie to limit her children? Controlling them with guile and deceit. Kyven's powers would then be to change the reality of himself, using shadow powers, and the reality of the world around him, using his shaman powers. The ultimate expression of the Shadow Fox Spirit's mantra could be: what is real?
This might also explain why Kyven would eventually not need to worry about the shadow monsters whilst traveling as he could just take on their appearance or reality so that he fits into their perception of normal in the shadow realm.
<jumping up and down like a giddy child>Look! Look! New Chapter!
