THE SWORD OF TOTSUKA
Itachi’s Susanoo was the wielder of the sword of Totsuka, which is an eternal blade that can seal anyone that it pierces in a gen-jutsu for eternity. According to the myth, the sword of Totsuka was inherited by Susanoo from his father, Izanagi. With this sword, Izanagi had killed his new born son kagu-tsuchi, the fire god, whose birth has burned his mother Izanami to death.
OROCHIMARU AND THE SWORD OF KUSANAGI:
According to the myth after being exiled from heaven for his misconduct towards Amaterasu, Susanoo killed Yamata no Orichi(The legendary Eight-Forked-Serpent) with his Sword of Tatsuka and obtained The Sword of Kusanagi. According to me, the charter Orochimaru was built with a reference from Yamato no Orichi, whom Sasuke Uchiha killed. In the anime, Sasuke was the wielder of the sword of Kusanagi throughout the shippuden series…
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*Sources of information- Wikipedia.