Life Force

𝐋𝐢𝐟𝐞 𝐅𝐨𝐫𝐜𝐞 (生命力, "𝐈𝐧𝐨𝐜𝐡𝐢𝐫𝐲𝐨𝐤𝐮") 𝐢𝐬 𝐭𝐡𝐞 𝐥𝐢𝐟𝐞 𝐞𝐧𝐞𝐫𝐠𝐲 𝐨𝐟 𝐚𝐥𝐥 𝐩𝐞𝐨𝐩𝐥𝐞 𝐚𝐧𝐝 𝐥𝐢𝐯𝐢𝐧𝐠 𝐭𝐡𝐢𝐧𝐠𝐬 𝐛𝐚𝐬𝐞𝐝 𝐨𝐧 𝐭𝐡𝐞 𝐬𝐭𝐫𝐞𝐧𝐠𝐭𝐡 𝐨𝐟 𝐭𝐡𝐞𝐢𝐫 𝐩𝐡𝐲𝐬𝐢𝐜𝐚𝐥 𝐞𝐧𝐞𝐫𝐠𝐲. 𝐈𝐭 𝐠𝐨𝐯𝐞𝐫𝐧𝐬 𝐨𝐧𝐞'𝐬 𝐬𝐭𝐚𝐦𝐢𝐧𝐚, 𝐝𝐮𝐫𝐚𝐛𝐢𝐥𝐢𝐭𝐲 𝐚𝐧𝐝 𝐥𝐨𝐧𝐠𝐞𝐯𝐢𝐭𝐲. 𝐈𝐭 𝐝𝐨𝐞𝐬 𝐧𝐨𝐭 𝐜𝐚𝐫𝐫𝐲 𝐦𝐞𝐦𝐨𝐫𝐢𝐞𝐬 𝐨𝐫 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞𝐬 𝐚𝐧𝐝 𝐟𝐨𝐫 𝐭𝐡𝐞 𝐦𝐨𝐬𝐭 𝐩𝐚𝐫𝐭 𝐜𝐚𝐧𝐧𝐨𝐭 𝐛𝐞 𝐜𝐨𝐧𝐭𝐫𝐨𝐥𝐥𝐞𝐝. 𝐈𝐭 𝐜𝐚𝐧 𝐛𝐞 𝐟𝐮𝐫𝐭𝐡𝐞𝐫 𝐝𝐞𝐟𝐢𝐧𝐞𝐝 𝐚𝐬 𝐚 𝐩𝐞𝐫𝐬𝐨𝐧𝐬 𝐩𝐡𝐲𝐬𝐢𝐜𝐚𝐥 𝐞𝐧𝐞𝐫𝐠𝐲'𝐬 𝐩𝐨𝐭𝐞𝐧𝐭𝐢𝐚𝐥 𝐭𝐨 𝐬𝐮𝐬𝐭𝐚𝐢𝐧 𝐚𝐧𝐝 𝐢𝐧𝐯𝐢𝐠𝐨𝐫𝐚𝐭𝐞 𝐭𝐡𝐞𝐦.

***𝐍𝐨𝐭𝐞:** 𝐀𝐥𝐭𝐡𝐨𝐮𝐠𝐡 𝐭𝐡𝐞 𝐭𝐞𝐫𝐦 𝐥𝐢𝐟𝐞 𝐟𝐨𝐫𝐜𝐞 𝐚𝐩𝐩𝐞𝐚𝐫𝐬 𝐢𝐧 𝐭𝐡𝐞 𝐬𝐞𝐫𝐢𝐞𝐬 𝐪𝐮𝐢𝐭𝐞 𝐚 𝐛𝐢𝐭 𝐢𝐭 𝐢𝐬 𝐧𝐞𝐯𝐞𝐫 𝐝𝐞𝐟𝐢𝐧𝐞𝐝. 𝐓𝐡𝐢𝐬 𝐚𝐫𝐭𝐢𝐜𝐥𝐞 𝐰𝐚𝐬 𝐰𝐫𝐢𝐭𝐭𝐞𝐧 𝐛𝐲 𝐦𝐲𝐬𝐞𝐥𝐟 𝐢𝐧 𝐨𝐫𝐝𝐞𝐫 𝐭𝐨 𝐞𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐥𝐢𝐟𝐞 𝐟𝐨𝐫𝐜𝐞 𝐢𝐬, 𝐛𝐚𝐬𝐞𝐝 𝐞𝐧𝐭𝐢𝐫𝐞𝐥𝐲 𝐨𝐧 𝐜𝐚𝐧𝐨𝐧 𝐜𝐨𝐧𝐜𝐞𝐩𝐭𝐬, 𝐩𝐡𝐫𝐚𝐬𝐢𝐧𝐠 𝐚𝐧𝐝 𝐞𝐱𝐩𝐥𝐚𝐧𝐚𝐭𝐢𝐨𝐧𝐬. 𝐏𝐥𝐞𝐚𝐬𝐞 𝐚𝐥𝐬𝐨 𝐧𝐨𝐭𝐞 𝐭𝐡𝐚𝐭 𝐜𝐡𝐨𝐨𝐬𝐢𝐧𝐠 𝐨𝐧𝐞 𝐨𝐟 𝐭𝐡𝐞 𝟔 𝐭𝐢𝐞𝐫𝐬 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐂𝐡𝐚𝐫𝐚𝐜𝐭𝐞𝐫 𝐩𝐚𝐠𝐞𝐬 𝐦𝐮𝐬𝐭 𝐛𝐞 𝐝𝐨𝐧𝐞 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐜𝐡𝐚𝐫𝐚𝐜𝐭𝐞𝐫'𝐬 𝐛𝐚𝐬𝐞 𝐥𝐢𝐟𝐞 𝐟𝐨𝐫𝐜𝐞, 𝐧𝐨𝐭 𝐭𝐡𝐞𝐢𝐫 𝐥𝐢𝐟𝐞 𝐟𝐨𝐫𝐜𝐞 𝐰𝐡𝐞𝐧 𝐚𝐮𝐠𝐦𝐞𝐧𝐭𝐞𝐝 𝐛𝐲 𝐭𝐞𝐜𝐡𝐧𝐢𝐪𝐮𝐞𝐬.*

## 𝐎𝐯𝐞𝐫𝐯𝐢𝐞𝐰

One's life force determines their lifespan and overall vitality. The more one has, the longer they live and the slower they age. Life force is ordinarily not visible to the unaided eye unless it is highly concentrated or manifested in large amounts, similarly to chakra. This is extremely rare. If a person has a large life force their chakra becomes more potent and their ability to withstand exhaustion and powerful attacks without succumbing increase. Having a large life force acts upon different people in different ways. Injuries that are generally fatal may still kill but do not as quickly一it is possible to lose a limb or even be bisected and still survive or function normally. Those with these traits are strong enough to survive the removal of tailed beasts, although they are still left severely weakened afterwards and will inevitably die.

### *𝐏𝐡𝐲𝐬𝐢𝐜𝐚𝐥 𝐄𝐧𝐞𝐫𝐠𝐲 𝐚𝐧𝐝 𝐘𝐚𝐧𝐠 𝐑𝐞𝐥𝐞𝐚𝐬𝐞*

One's life force's power directly depends upon the quality of their physical energy. Physical energy is energy produced by all of the body's cells and is one of the components to chakra, the other being spiritual energy. As such, it is possible to increase the power of one's life force, though the amount generally seems to be inconsequential.

Yang Release (which is chakra with a higher ratio of physical energy than spiritual energy) is said to "govern vitality, granting life to forms that have none." Naturally then, the greater one's physical energy the greater their life force and the greater their life force the greater their Yang Release.

### *𝐇𝐞𝐚𝐥𝐢𝐧𝐠*

Because life force is based on physical energy it can also be used to restore physical damage. Iryojutsu]] can be either Yin Release or Yang Release. Life force healing is generally natural and has often been called Regeneration Ability. This power, however, cannot restore limbs unless one possesses a life force on par with that of the Jūbi who allowed Madara Uchiha to regenerate a tragically deformed body. Madara did this, however, because he possessed both the Yang and Yin power of the Sage of Six Paths. The Nine Tails Fox yang portion allowed Naruto Uzumaki to heal from damage at a much quicker rate. Regularly, however, those with life force healing simply heal from damage quicker than others. This is the case with all shinobi who possess a greater physical energy than average people.

### *𝐑𝐞𝐢𝐧𝐜𝐚𝐫𝐧𝐚𝐭𝐢𝐨𝐧*

Apparently, if a person's soul has not passed on to the Pure Land they can be bought back to life using certain Reincarnation Ninjutsu like Chiyo's One's Own Life Reincarnation which uses chakra as a medium to transfer one's life force to someone else. Even if someone is not dead the life force can still be given resulting in their recuperation but the weakened state of the technique user. The exhausted state of the user in such a situated further illustrates life force's connection to physical energy.

### *𝐄𝐱𝐚𝐦𝐩𝐥𝐞𝐬*

In all these cases, life force is always linked to physical energy and Yang Release, demonstrated in energetic and life-giving abilities. It should be noted that the Senju and the Uzumaki clan (descendants of the Senju) are praised as having the greatest life forces.

* Hashirama Senju, the lord of the Senju, no doubt inherited his clan's life energy in a particular way, giving him the ability to produce life with his chakra in the form of Wood Release. In order to create plant life, one would certainly need vitality and life energy to do so. His granddaughter, although not inheriting this ability, did indeed inherit a powerful life force from him.

* Mito Uzumaki married Hashirama Senju and was born far before Kushina Uzumaki. She lived well pass 100 years old and even retained the color of her hair in her old age. She is the grandmother of Tsunade.

* Tsunade's display of natural superhuman strength is a clear sign that she has a powerful physical energy. Tsunade is a descendant of both the Senju and Uzumaki, inheriting both their vitality. Tsunade also possesses enough life force to cling to life, even after being cut in half or losing most of her chakra. When Tsunade was cut in half and her body exhausted, her life energy waned and she became much weaker, albeit still surviving.

* Naruto had the Yang portion of Kurama sealed inside of him. When coming into contact with Hashirama's clones (the Zetsu) these clones were overcome with life energy and bloomed into trees.

* Karin Uzumaki uses her life force to heal even those on the brink of death through the biting and sucking of her flesh. This would be characterized as Yang Release medical ninjutsu.

* Kushina Uzumaki had the Nine Tails Fox extracted from her and lived for many moments afterward, even capable of moving quickly to shield her newborn son. This is a testament to her physical energy and capacity to continue forward when she should be dead.

## 𝐓𝐢𝐞𝐫𝐬

### *𝐓𝐢𝐞𝐫 𝟎/𝟔: 𝐖𝐞𝐚𝐤*

Your life force, the tangible power keeping you alive, is weak. An average human amounts to this.

### *𝐓𝐢𝐞𝐫 𝟏/𝟔: 𝐀𝐯𝐞𝐫𝐚𝐠𝐞*

You've increased the power of your life force through training and simply getting older. Genin are generally at this level. A fatal wound will kill you, generally outright.

### *𝐓𝐢𝐞𝐫 𝟐/𝟔: 𝐀𝐛𝐨𝐯𝐞 𝐀𝐯𝐞𝐫𝐚𝐠𝐞*

Your training has paid off and your physical conditioning has increased the power of your life force considerably. It may also be that this is a result of a kekkei genkai. You might lose blood during battle or be fatally-wounded but you can still last a little longer.

### *𝐓𝐢𝐞𝐫 𝟑/𝟔: 𝐒𝐭𝐫𝐨𝐧𝐠*

You've reached the maximum life force level obtained by training; no training can allow a person to go beyond this tier. If you're wounded in a battle a few times or even lose a limb you can still continue forward before succumbing. If you've been given some time to sleep and eat you will recover from your injuries in a few days if given proper medical treatement.

### *𝐓𝐢𝐞𝐫 𝟒/𝟔: 𝐑𝐚𝐫𝐞*

No such training can give you this tier of life energy. Losing limbs and being heavily wounded will not kill you right away. In fact, you might even survive the extraction of a tailed beast, though you'll certainly be unconscious for a few minutes before dying. Given some time to rest you recuperate physically quite quickly, though you still might have open wounds and scratches.

### *𝐓𝐢𝐞𝐫 𝟓/𝟔: 𝐑𝐞𝐦𝐚𝐫𝐤𝐚𝐛𝐥𝐞*

You are simply remarkable; being chopped in half is not enough to kill you, is it? You can cling to life by the smallest thread while maintaining consciousness and still being able to weave signs and fight, though at a limited rate. If you had a tailed beast extracted you would still live and be conscious. Your natural-healing is much quicker than others as well, though it doesn't always manifest as it has in Hashirama Senju and the host of the Nine Tails.

### *𝐓𝐢𝐞𝐫 𝟔/𝟔: 𝐀𝐬𝐭𝐨𝐧𝐢𝐬𝐡𝐢𝐧𝐠*

You are beyond rare. In fact, very few people exist like you. Those with such a level of life force are similar to Madara Uchiha who obtained the power of the God Tree.You will not slow down even an inch after being cut in half and you will maintain your faculties completely if you are damaged fatally several times in succession. Your life force is so powerful that you might even be immortal as a result of it; the removal of your head is not enough to kill you.

(It cannot be stressed how incredibly rare this tier is. Speak to moderators before choosing it.)

## 𝐓𝐫𝐢𝐯𝐢𝐚

* The anime and manga never truly expanded on life force. Based on deduction and a bit of research, this is the conclusion on life force's definition that is canon.

* The Uzumaki clan is known for their strong life force which gives them their famous power.