Here is a concise summary of the Impure World Reincarnation (Edo Tensei) technique from the Naruto universe:
**Technique Overview**
* S-Class, Forbidden Ninjutsu created by Tobirama Senju
* Brings a dead person back to life using a DNA sample and a living sacrifice as a vessel
* Requires a ritual with a scroll and blood/DNA smearing
**Key Characteristics**
* Summoner has control over the reanimated person
* Reanimated person can have their free will and personality intact, partially restricted, or completely eradicated
* Retains all abilities from their lifetime, even if not originally theirs
* Has infinite chakra and regenerative abilities
**Limitations and Flaws**
* Reanimated person's soul must be in the Pureland (Naruto afterlife)
* Can be affected by powerful Genjutsu, potentially turning against the summoner
* If the reanimated person knows the hand seals, they can break free from the summoner's control
**Overall**: A powerful, yet complex and flawed technique that can create a potentially endless army of immortal, powerful shinobi, but with significant risks for the summoner.
Here are the key facts extracted from the text, numbered and in short sentences, excluding opinions:
**Technique Overview**
1. The technique is called "Edo Tensei" or "Impure World Reincarnation".
2. It's an S-Class, forbidden ninjutsu in the Naruto universe.
3. Created by Tobirama Senju, derived from the summoning technique.
**Requirements and Process**
4. To use Edo Tensei, a sample of the person's DNA is required (e.g., a small blood sample).
5. A living sacrifice is needed to serve as a vessel for the revived person.
6. The ritual involves a scroll with the person's DNA and a specific activation process.
**Effects on the Reanimated**
7. The reanimated person's personality, chakra, and appearance are replaced by those of the revived individual.
8. The summoner has control over the reanimated person.
9. Reanimated shinobi retain their original abilities, even if not originally theirs.
10. They have infinite chakra and can regenerate from injuries.
**Limitations and Flaws**
11. The soul of the person to be reanimated must be in the "Pureland" (Naruto afterlife).
12. Not all souls go to Pureland after death; some exceptions exist.
13. Initially, reanimated shinobi were weaker than in life, but this flaw was later overcome.
14. A reanimated person can be affected by genjutsu.
15. If a reanimated person knows the Edo Tensei hand seals, they can break free from the summoner's control.
**Historical Development**
16. Tobirama initially created the technique with limitations (weaker reanimations, control cap).
17. Orochimaru later improved the technique, reducing its flaws.
18. Kabuto eventually mastered the technique, eliminating the original flaws.