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I always thought that blood is necessary to perform the summoning jutsu.
However, I saw the second Mizukage and Madara performing it while being [Edo
Tensei](http://naruto.wikia.com/wiki/Summoning:_Impure_World_Reincarnation),
so is it really possible?


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2017-06-23T05:50:40.347
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question
naruto
Is blood necessary to perform the summoning jutsu?


No

[Summoning Technique](http://naruto.wikia.com/wiki/Summoning_Technique)

> ... and seemingly did not require a blood offering when performing this
> technique.


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2017-06-23T08:03:56.883
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Technically, yes.

Why do you need blood?

Well [this](https://anime.stackexchange.com/a/27640/20270) answer states that:

> **the blood serves as a means of identifying the summoner for the summoned
> and also acts as a price (sacrifice) for calling them.**

So you **need** a "sacrifice" (in this case blood) to summon.

But, according to the
[Wikia](http://naruto.wikia.com/wiki/Summoning_Technique), Nagato can summon
without this sacrifice:

> While most summoners have only been shown capable of summoning one type of
> creature, **Nagato (through the Animal Path) was able to summon several
> different animals and even people, and seemingly did not require a blood
> offering when performing this technique**.

I suppose since the [Animal Path](http://naruto.wikia.com/wiki/Animal_Path)
was a dead person, then it didn't need blood. Same goes for the Second
Mizukage and Madara.

  * Reanimations can't bleed because

> Any damage they receive will regenerate in time and, assuming the damage is
> not too debilitating, they can continue attacking even before their body
> recovers. [![enter image description
> here](https://i.stack.imgur.com/R4EpK.png)](https://i.stack.imgur.com/R4EpK.png)
> \-
> [wikia](http://naruto.wikia.com/wiki/Summoning:_Impure_World_Reincarnation)


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