Flying Thunder God Slash and The Sword of the Thunder God.

[BlacLord™]

First and foremost, the latter was Anime only.

Secondly, the swords are in no way similar:

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And no, a very ordinary Katana does not transform or change to the point where it is completely different and made out of different material. The latter sword activated like a lightsaber.

Just to point out they are not the same thing.

 

[Moss]

He could just channel his chakra into it...

 

[-Raviel-]

It could just be a different weapon...

 

[Lucidus]

He could just channel his chakra into it...

it still wouldnt explain the change in the shape of the katana such as the hilt of the sword... if anything if his chakra was channeled through the blade it would just have glow of the chakra around the blade

 

[BlacLord™]

He could just channel his chakra into it...

The whole Sword of the Thunder God was just lightning. It was like a lightsaber.

 

[Ōkami]

The sword of the thunder god was just stupid to begin with.

 

[StraawHat]

Star Warss!

 

[Moe22]

Never take filler seriously :stfu:

 

[BlacLord™]

Never take filler seriously :stfu:

Just worry some people are going to use it in arguments...

 

[Penguin]

He could just channel his chakra into it...

Ya, Tobirama can channel chakra. It can be called, the Water Sword of Doom?