After chapter 1, Jack becomes A MAJOR target by peisma and his minions

So the Voidshifter queen (that's a thing) decides to take Rosa's form. Of course, they cannot take the exact form of Rosa, though.

How does this have to relate to the other post?

Because this "imposter" is skinny

Voidshifters are kinda incapable of really changing into anything significantly larger than them, so they use a form of telekinesis/brainwashing to screw with people's minds mainly.

And they can't really gain weight

So the Voidshifter queen, being a female voidshifter (males can still reproduce asexually), decides to see the job of taking Jack out herself

But that's easier said than done

Even with the female voidshifters ability to mess with people's minds!

But, the queen being the strongest voidshifter can still decently screw with Jack

Jack can see through voidshifters disguises, how? (He cannot easily see through the queen's disguise tho)

You'll see later