It sounds similar to the techniques I'm familiar with. Where I'm from, only demons are capable of executing them through the use of their blood.

[ the humans in the demon slayer corps are capable of many feats themselves, but not something like this, and certainly not to this scale. muzan's demons mostly operated on their own, their power augmented when he'd initially shared his blood with them, but he'd never stoop so low to actually work together with them. still, perhaps it's too early to rule that possibility out. either way, she's not sure if it's better or worse. ]

Oh? [ her smile turns a little playful at that last statement as she brings the cup to her lips. ] Would you like to check if we are real, then? Just to be sure, of course.