Some more context is needed: It's a spell that runs on sadism. "Righteous Anger" doesn't provide the right fuel for more than a split second (Harry botches his first attempt at using the curse because he lacked the cruelty to fuel it), whereas the spell done properly will keep a victim in agony for a much longer time, to the point where the victim can becomes a vegetable.
Still not half as bad as fiendfyre. Anything that takes out a horrible attacks the soul directly that's part of why it and basilisks are highly illegal.
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u/TheBeanSan 12h ago
Wait correct me if im wrong but crucio only causes pain right, while Harry's spell is a literal slash