However, Frankenstein uses the weapon's ravenous nature to defeat his opponents, e.g. For example, the weapon sometimes manifests its own will and tries to consume and devour its master.
While Frankenstein has been shown to have mastered considerable control over the weapon, being able to forge powerful items from its dark matter and to use it in battle his control is not complete. It materializes from air like a Soul Weapon does, but unlike a normal Soul Weapon, the aura it gives off is extremely dark and overwhelmingly malicious. The Dark Spear is a human-made version of the Soul Weapons.