Life Force

The **Life Force** (生命力, "Inochiryoku") is the essence of a person, generally governed by one's physical energy. It also determines the person's lifespan.

## **Life Force Tiers**

### **Poor 0**

The amount of life force, the tangible power keeping you alive, is poor. You could be branded with a low life expectation.

* A sick child
* A elder

### **Average 1**

You might be someone that have an average life force, this is where the majority of civilians and shinobi is at. With this you have a lifespan and aging progress as a human. It is rather difficult for someone to become a Jinchuriki as it usually resulted in one's death.

* Shinobi (Shino Aburame, Sai, and others like them) can die from normal means such as being bisected in half, or being stabbed in the heart.
* The elders can still perform as a shinobi even well after their retirement in old age. (Hiruzen, Chiyo) but with some difficulties.

### **Strong 2**

You have a exceptional life force that enables you to live well. With the life force you can survive being stabbed, life threatening injuries with some difficulties. You might live longer than your comrades, passing them even after age of 100.

* Though it can be rare, it is possible to become a jinchuriki with this sort of life force. **However this would be determined by your luck.**

### **Rare 3**

You have been born with a rare life force that endowed you to survive the most enduring tasks that a civilian or even a shinobi could not survive from; becoming a Jinchuriki to a tailed beast or being extracted of the tailed beast. You could survive being bisected, or otherwise life-threatening injuries. This usually happens in members whose clan are known for having a massive life force like the Uzumaki Clan.

* The members of Uzumaki Clan are said to have large reserves of life force.
	+ Mito Uzumaki became the first Jinchuriki of the Nine-Tails and survived the process. Even after several years had passed, she still retains some hair color in her age.
	+ Kushina Uzumaki also became the second Jinchuriki of the Nine-Tails and survived the process. She can fight aside her husband without much difficulty despite after the tailed beast extraction and gave birth before that. She did not also die immediately after being stabbed by Kurama's claw.
	+ Nagato is a member of the Uzumaki Clan. Even after being stabbed by the black receivers he could perform countless jutsu and control the six paths of Pain despite the condition.
	+ Tsunade, as a descendant of Uzumaki and Senju, could survive being bisected in half and still have the strength to heal her fellow kage despite her condition at the time. She appeared to be not suffering from the side effects of the Creation Rebirth, which is said to reduce the user's lifespan, in the Boruto Anime. In which could be credited to her unique heritage.
	+ Naruto Uzumaki had became the third jinchuriki of the Nine-Tails, despite that he was born, without much difficulties. It is noted that Naruto couldn't last a minute without assistance after the Nine-Tails extraction.
* The members of Senju Clan are said to have large reserves of life force.
	+ Hashirama Senju is noted to have a incredible life force out of the Senju Clan, in which enables him to manifest an rare Kekkei Genkai, Wood Release. He is considered as the pinnacle of this tier.

### **Ultra 4**

You have been born with a huge amount of life force that couldn't be compared to any existing clan. It enables you to survive all of the damages, life-threatening injuries and even techniques that would reduce your life force; it simply couldn't make a dent. However, you still can die despite the extraordinary feats. **Heavily moderated as it isn't something achievable by a character.**

* Obito Uchiha, by making use of the Gedo Statue, could survive well after the Ten-Tails extraction which would otherwise claim his life.
* Ten Tails grants its host a incredible life force that enables one to regenerate, unable to age, and even live beyond your natural lifespans.

### **Gargantuan 5**

You might have been born with a gargantuan life force, this might be due to luck or being a member of the Otsutsuki Clan. You might have a corpse that acted as your vessel, allowing you to operate normally, without it being reduced to time. **Heavily moderated as it isn't something achievable by a character.**

* Isshiki is capable of having the Living Corpse "Jigen" to retain its youthful appearance, even after a thousand years.

### **Inconceivable 6**

You are the sovereign of life itself, and have refined what it means to be a immortal. Eruption of forests and even ponds would form at your footsteps; your very presence evoke life in even the most scarce lands like the desert. You couldn't die from even extraordinary means as you defied the existence of death altogether. **Heavily moderated as it isn't something achievable by a character.**

* Shibai Otsutsuki is considered as one of those beings that has such inconceivable life force.

## **Usage**

It is noted that one could perform countless acts with life force. Here's the list below that had been used in canon.

### **Reincarnation**

There is reincarnation techniques that allowed you to resurrect the dead, as long the soul had not moved on, with life force bestowing but usually at the cost of the user's life.

* Chiyo had used the One's Own Life Reincarnation to transfer the remaining amount of her life force to Gaara.
* Ryuzetsu, by using the Dragon Life Reincarnation, could resurrect Naruto Uzumaki from the dead despite the wounds dealt to the Uzumaki.

### **Healing**

It is noted that when someone bestowed one's life force to another it also healed wounds and injuries that would have been life-threatening in the target's case.

* It appears to be the case in Naruto Uzumaki, as the Nine-Tails' physical energy are enough to heal its host from injuries and wounds in tandem.
* Hashirama Senju, while using Wood Release, could bestow himself a regeneration ability that enables him to heal from life-threatening injuries.