After making it back to the tavern with the severed head, Alice immediately began injecting it with her own blood.
Naturally, if she was to do so without care, the head would mutate and die because of the potency.
But once she adjusts it and activates her first Sigil, she'll be able to keep the hybrid locked into an illusion of her own choosing.
Of course, there were limits to this. She can only make hints towards the illusion and set up parameters for the brain to work with rather than curate all of the details.
But setting that aside, she was essentially forcing the hybrid to experience a peaceful village life with hopes and dreams of normal people. She would think everything was a lie and if she was to question the people around her, their response would be whatever she would accept subconsciously.
The answer the brain thinks up of when asked a question.
When the subconscious wonders, "what kind of answer would I accept?"
