Magnetic Bone Control

The user forms a mask of bone on their face containing special chakra that amplifies their kekkei genkai. The user this special chakra to control the amount of iron present in their blood, and uses it to coat their bones. This chakr also magnetizes the iron greatly. These bones are synced to seek out high sources of heboglobin found in blood. This also allows them to control their bones in mid air, allowing for greater flexability and ease of control, allowing one to create last minute evasions to catch opponents off guard.

It's said by Neko Kaguya herself that Oni Kaguya used this against the Seven Ninja Swordsman of the Mist, which eventually lead to the deaths of 3 of its members; Jūzō Biwa, Kushimaru Kuriarare, and the sword master himself Mangetsu Hōzuki.