

Can explain to me the fight between Sasuke and Naruto? Naruto had the nine-
tails inside him and showed vigorous power, but how did Sasuke end up being so
strong? How did he turn into a bird-like thingy?

My overall question is: What monster is inside Sasuke that makes him this
powerful? That isn't a tailed beast ... I guess?


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2016-04-07T22:05:35.783
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2019-10-25T19:30:02.707
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naruto
What monster is inside Sasuke?


His overwhelming power stems from the [Cursed Seal of
Heaven](http://naruto.wikia.com/wiki/Cursed_Seal_of_Heaven) that Orochimaru
inflicted on him. While we see the curse mark causes him pain, he is able to
use it to drastically increases his power.

The Naruto Wikia notes this:

> Like all cursed seals, the user receives increased chakra levels and
> physical capabilities when the seal is active, to the point where with the
> second level, Sasuke was equal in power to Naruto's one-tailed form when he
> first used it.

There is no monster inside of Sasuke, nor a tailed beast like the jinchuuriki.
The transformation is caused by activating the second level of the curse mark.

> When Sasuke activated the second level of the seal, his skin turned dark-
> grey and his hair grew and turned dark blue. His eyes also turned dark grey.
> Additionally, he grew webbed-claw-shaped wings from his back which he could
> use to fly and glide, and a dark, star-shaped mark appeared across the
> bridge of his nose.


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answer