Sasuke Uchiha obtains the Eternal Mangekyou Sharingan by undergoing a unique ocular transplant procedure: he receives the eyes of his older brother, Itachi Uchiha. This critical step is the only known method within the Uchiha clan to achieve this perfected form of the Mangekyou Sharingan.
The Path to Eternal Mangekyou Sharingan
The Eternal Mangekyou Sharingan is a rare and powerful evolution of the Sharingan, designed to overcome a significant drawback of its predecessor.
The Mangekyou Sharingan's Drawback
While the standard Mangekyou Sharingan grants its user immense power and access to formidable abilities like Amaterasu, Susanoo, and Tsukuyomi, its continuous use comes at a steep price. Prolonged and excessive use of the Mangekyou Sharingan leads to deteriorating eyesight, eventually culminating in blindness. This gradual loss of vision forces users to seek an alternative or face incapacitation.
The Solution: Sibling Eye Implantation
To counteract the inevitable blindness and further enhance their ocular prowess, a Mangekyou Sharingan user must implant the Mangekyou Sharingan of a close blood relative, specifically a sibling, into their own eye sockets. This process merges the chakra and genetic patterns of both eyes, resulting in the creation of the Eternal Mangekyou Sharingan. This fusion not only restores the user's vision but also grants them even greater power and resilience without the risk of future sight degradation.
Sasuke's Specific Journey
Sasuke, having awakened his own Mangekyou Sharingan after Itachi's death, began to experience the characteristic vision deterioration. Recognizing the need for greater power to achieve his goals and to preserve his eyesight, he sought out his older brother's eyes. After Itachi's demise, Sasuke decided to transplant Itachi's Mangekyou Sharingan into his own.
This transformative procedure granted Sasuke the Eternal Mangekyou Sharingan, ensuring his vision would never again diminish from overuse. His new eyes represented a powerful fusion, visually characterized by his original Mangekyou pattern overlapping with Itachi's design.
Benefits of the Eternal Mangekyou Sharingan
The acquisition of the Eternal Mangekyou Sharingan offers unparalleled advantages to its user:
- Permanent Vision: The most crucial benefit is the complete and permanent restoration of eyesight, negating the risk of blindness associated with the regular Mangekyou Sharingan.
- Enhanced Abilities: The power of the Mangekyou Sharingan abilities, such as Amaterasu's flames or Susanoo's protective avatar, is significantly amplified.
- Reduced Chakra Strain: While still powerful, the Eternal Mangekyou Sharingan is generally less taxing on the user's chakra reserves compared to the standard Mangekyou.
- Unique Visual Pattern: The Eternal Mangekyou Sharingan possesses a distinct visual pattern, combining the designs of the original and the implanted Mangekyou eyes.
Mangekyou vs. Eternal Mangekyou Sharingan
| Feature | Mangekyou Sharingan | Eternal Mangekyou Sharingan |
|---|---|---|
| Vision Deterioration | Yes, leads to eventual blindness | No, vision is permanent and stable |
| Power Level | High | Significantly higher |
| Acquisition | Experiencing profound emotional trauma | Transplanting a sibling's Mangekyou Sharingan |
| Chakra Cost | High, especially for powerful techniques | Lower, more sustainable for extended use |
| Visual Appearance | Unique to the individual user | Fusion of original and implanted eye patterns |
