""Amaterasu", representing "the material world and light" and "Tsukuyomi", symbolizing "the spiritual world and darkness", are two jutsu that can only be used by the ones who awakened the "Mangekyou Sharingan", the almighty eyes that can see through anything. The power of the violent god resides in the ones who are able control both jutsu: that is Susanoo. The chakra becomes tangible and takes the shape of the great, strong belligerent god. His fighting spirit doesn't abate until he has destroyed all the enemies before him.
Susanoo possesses a flawless offense and defense thanks to the "incorporeal tools" he holds in both of his hands. The "Sword of Totsuka" in his right hand cuts down any opponent, while the "Mirror of Yata" in his left hand rejects any attack. Material, incorporeal, ninjutsu, physical attacks: all these have no meaning in front of the god."
Captions:
"The Mangekyou Sharingan is feared as the strongest doujutsu, but only some of its possessors can reach this further godlike state. This jutsu works both as the user's guardian deity and as something that consumes his life." (Hmm, just reading the manga it wasn't clear that Susanoo also ate at the user's health.. This makes even more evident why Itachi died soon after using it, I guess; ndt)
"The sake coming out of the gourd takes the shape of a sword, the Sword of Totsuka. The spirits absorbed by the sword also get sealed inside of the gourd."
"Totsuka no Tsurugi (Sword of Totsuka) - It's like a Sword of Kusanagi enhanced with the power to send the people it stabs to a world of illusions similar to the dream of a drunken person and seal them for eternity. It has a built-in sealing jutsu."
"Yata no Kagami (Mirror of Yata) - An incorporeal shield. It possesses all the chakra qualities (elements) and is able to render any attack vain by changing its own quality accordingly."
