This is an art I did to show the scar that Baxrex opened on Shadow's eye.
This is the same one that Vextoral gave her when she was litte. And she kept it hidden with makeup. Now that Baxrex has cut it open once again, and that she is in her Dark Form, she is enraged by this and loses full control of herself, making her forget who she is or was, and who the people she cared about were.
In this state, she is a dangerous being that can destroy anything that lies in her path of destructional rage.
But, there IS a way that she can escape this fate, however.
She has to overcome her Inner Demons.
What that means is that, while in this state, she is trapped in her mind where is pitch black and all her forms are aggressive towards her as she desperately runs away in fear of dying in her own body.
It's because she is afraid of herself, so, she runs away from others because she is actually afraid of herself and what she might do.
If she can conquer her fears, she might be able to control herself in this form. The downside is, she can't remember what happens once she turns into this.
Because of this, the cause is that she can't fight back her inner demon self. So, for the result of this, the darkness that this form holds gives her what I call, 'Memory Block', meaning the darkness makes her forget what happens once her vision goes red and black.