Clan Name: 剛鉄, Gōtetsu, "Strong Iron"
Appearance:
How and why it formed: The clan was formed after many brutal battles during the first wars of the shinobi. There were many people who had learned that by absorbing the iron in the blood of their enemies, they would become much stronger, and even gain the ability to heal. This strength passed on to the future generations of the people, and the habit continued until they seemed to peak at a certain point, in which they formed a clan, and joined different villages.
What it does: Members of the Gōtetsu clan have much denser muscles and skin than the average person. This makes them a bit heavier, but it also makes them immensely stronger and more durable than others of their species. Their bodies are said to be perfect, although they still need to train to keep them that way once they turn 13. Their strength is enough to crush rocks in their hands and bend weaker metals by the age of 7. This continues up until they die, older clan members being the strongest people in the world, even though their bodies don't seem to agree with them.
At the highest level, the user could possibly lift up a slab of earth sizable enough for a small village to sit on top of, while they are durable enough to block normal weapons with their bodies.
Durability: The clan member's body is dense enough to withstand normal weapon attacks and severely hamper the damage of techniques that are the same rank as they are, halving the damage that they take from techniques of the same rank. Techniques one rank below do nearly no damage, and techniques two ranks below them do nothing. Their hands, feet, shins, and forearms able to take the most damage.
Academy Student: They are physically stronger than most people not of their clan, however they are just as durable as everyone else. People at this stage could lift as much as 5 times their body weight.
Genin: At Genin level, the users are much stronger, able to overpower almost anyone not using a ninja technique, and comfortable lift and throw 5 times their body weight, while being able to lift 15 times their body weight should they exert themselves to the max.
Chuunin: Chuunin can easily toss around 15 times their own weight, while being able to exert themselves to life 30 times.
Jounin: At this point, the clan members are able to unlock their latent ability to absorb an enemy's blood directly through their skin to heal themselves, and this makes them even stronger. For each person they kill and absorb their blood, they gain a Blood Charge. The blood Charges can be spent to increase the power of the clan member, allowing them to become even stronger. The user can spend the Blood Charges to increase their strength by 20% each blood charge spent. This is the point where the user's strength and durability become ludicrous, as Jounin level clan members are able to toss around 80 times their own weight comfortable, while being able to exert themselves and pick up twice the amount. This is also the point where the user can "brute force" their way out of certain techniques that are meant to bind them, such as the water prison jutsu. They can literally rip the jutsu apart, thus destroying it, if it is below their rank.
S ranked: At S ranked, the power level of the clan member skyrockets, as they are able to comfortable throw around 200 times their own body weight, while exerting themselves, lifting twice that, and can even use techniques to enhance this even more. Their durability allows them to withstand nearly any form of attack that deals damage at this point, their bodies even resisting poisons and acids. For poisons, only damage to the body caused by the poison is reduced by 75%, preventing the clan member from dying from poisons, although any effect, such as coughing, vomiting, nausea, etc takes full effect, the damage sustained by the body by the poison is highly reduced, the same for acids. Each time he bathes in a killed enemy's blood, the clan member now gains 2 Blood Charges.
SS/Kage: I'll make something insane for this portion, if it ever gets to this point of course.
More information?: They wicked swol son
Requirements: Must be born a member OR a clan member can override your current bloodline ability by letting you drink their blood over the course of several weeks.