Board Thread:Fourth Databook/@comment-4271790-20141104211032/@comment-945885-20141104230545

Kaguya's Murderous Bone Ash is listed as a kekkei mora. It says she can use it to alter the properties of her bone, hardening them and turning them into weapons. It's different from, and more deadly than, Macabre Bone Pulse, as the target struck by the "ash bones" will immediately begin to disintegrate and crumble away as soon as their body is pierced.