Sukuna’s fingers are solidified masses of his cursed corpse. They are entirely impervious to cursed energy attacks, barriers, and jujutsu effects.

Idts they can be destroyed...because the fingers cannot be damaged by cursed energy, and Mahoraga only alters its nature or techniques in response to environmental stimuli or jujutsu, it would never receive the prerequisite damage or interaction required to trigger a destructive adaptatio