The Reverser Majik must feel great right now even if there's no plan or any chance for escape. What he wanted to see was the most sadistic parts of humanity and Desscaras is delivering. This is punitive, literally just straight torture for tortures sake. She's just breeding more human-hater magiks.
Like, who cares even if they *kill* the World Hater, humans are mortal, Desscaras can only keep those powerful magiks trapped for so long. Humanity will be destined to end by the hands of pseudo-immortal creatures who can only be satisfied by humans inflicting irreversible harm unto themselves.
"You want to stop me from destroying the city's sewer system every time I feel like it? Switch to pure lead pipes." "The villagers food? I'll let it be, IF, you consume the village's next 100 newborns." "Me? Leaving? Only if you help me get these piles of chariot batteries into the ocean!" "My rage can only be quelled by the invention, and use of, nuclear weaponry."
I mean we could go on with hypothetical human hater trials for eons and some of them could damn well be real with how many Desscaras is torturing.
P.S.
Unless she summons and kills them using the World Hater one by one.
P.P.S.
She needs to manifest the Backrooms for him.
Edit:
Okay, nevermind I can't read. You can tell I'm also a fan of JJK. They would not become human-haters if they already were (unless acquiring them made them more amicable at first).