The spells calls forth crackling black energy which roughly takes the form of a sword in the caster's hands. Because of this it can only be used in close combat. Only surpassed in power by the Giga Slave, the Ragna Blade's destructive force is enormous. Its effect extends to the Astral Plane, and no being, not even the Sword of Light or a ma-ō, can deflect it, although the stronger mazoku have astral bodies too big to be destroyed by a single swipe. It puts a likewise huge strain on the caster as well; it requires great bucket capacity to be cast (hence it requires amplification for a human caster), and the mere act of keeping the spell active drains the caster's strength tremendously.