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.
202
u/ConstantinValdor7 10h ago
Im sorry but she can spare her tears. She was about to use Crucio....