this technique is like Voodoo, this black magic will ignore victim durability same as Hidan's blood ritualDo people like RSM Naruto, Kaguya, and JJ Jins even sustain to injury in the form of blood? JJ madara got sliced in half but reformed, and Naruto tanked Kaguya's chakra arms and a chidori without getting scratched one bit.
KCM naruto even tanked lava and shit.
Sure they strong on the outside but inside them we cant said the same. Peoples trained to strengthen their outside body same as in real life. But no way people can train their heart, lung, kidney, liver, brain etc to get stronger or increase the durability of their internal organ.
Dont get your self blind here my friend when you saw Naruto can tanked Lava or somebody can tank some attack.
Look at Goku he can tank energy blast that can destroy planet but he cant tank heart attack
Same as hidan technique, he stab his own heart but the victim will feel the pain and will die afterward
Kaguya is exceptional