The Elder Daggers are the only weapons on earth that can subdue an Ancient Vampire. The Witch Heka used a powerful spell, using special blades coated it with their immortal blood making these daggers indestructable. It took alot of her magic in the process to create the daggers to help the vampire Aldric stop his family. Currently Lucius is the only one knows they truely exists and there location, as he hid them before he was imprisoned. The legend surrounding there existence had faded over the centuries. If an Ancient Vampire is stabbed in the heart and remains in place, they remain neutralized.
Aldric was stabbed in the heart by Lucius with one of the daggers.