[private]
No one here can hurt them except for us. Normal weapons are likely to have no effect on them. The Noah family is super-human and their power is immense, and the dark matter inside their bodies can only be countered by the Innocence that Exorcists of the Black Order wield.
There's only two dozen or so Exorcists in my world, although the Order has many supplementary members. There's five -- six of us here now, but until today only half of us possessed our Innocence. And no one has ever succeeded in permanently killing a member of the Noah family itself, since the spirit just reincarnates in a new host.