The Star Dragon Sword stated that he was the Night Rune itself, but transformed. The Night Rune is said to have the power of the darkness of night, as well as the ability to see through the darkness in people's hearts.
The Night Rune has strong influence over the Moon Rune. It is said that it hides its power as the Star Dragon Sword in order to defeat the vampires that the Moon Rune created.
Viktor would discover the rune in its sword form in the Cave of the Past and wield it during the Gate Rune and Dunan Unification Wars.