"Shoot a series of projectiles to inflict both damage and an effect that saps HP. Can continuously fire projectiles by holding RT/R2, and can be fired while in mid-air."
Murderous Bone Ash (共殺の灰骨 - Tomogoroshi no Haikotsu, lit. All-Killing Ash Bones) is one of the Abilities available to use in Jump Force.
Overview
The user holds their arms out, then fires barrages of spikes in a radial pattern. If they connect without blocking, they slowly drain health from the opponent.
When used as Kaguya, spikes protrude from her back.
Origins
Murderous Bone Ash is a special, Kekkei Mōra ninjutsu that is unique to Kaguya. The bone-like projectiles fired from this jutsu are always fatal, as they slowly turn the victim to stone. However, this obviously wouldn't have worked in Jump Force, so it merely acts as a standard projectile attack.
Murderous Bone Ash in action
Murderous Bone Ash fully charged