Alright, I'll be using my Ozymandias (Rider) bio.
The sun shone brightly on the empty prairie, the clouds absent, and the grass dancing gently in the breeze that swept over the land. Materialising in a golden flash of light before the boy, Ozymandias stands tall, knowing what his task would be in coming here. He ensure that by the end of the session, the young man before him would be ready to begin his journey into the ninja world.
"My name is Ozymandias. Ramesses II is my title, but you may refer to me by my real name. You are Kirito, and have come to learn the ways of the world."
Taking a moment to pause, Ozymandias utilises a simple Earth technique, creating two chairs that would face each other, out of the ground they stood upon. Taking a seat, the monarch beckons his new student to sit down as well. Once they're both seated, the pharaoh begins. He knew that this explanation would be a long one.
"Chakra is a form of energy that is inherent to every single living being. Originally, it came from what is known as the God Tree, and when its fruit was eaten, by a woman known as Ōtsutsuki Kaguya, she became the first to wield it. She passed the gift of chakra to her sons, Hagoromo and Hamura, and they too passed chakra to humanity. Now, every living thing produces chakra. It is created naturally in the body by the continuous moulding, or combination, of one's physical and spiritual energies. Physical energy is contained within the body's cells, and its production can be increased by physical training and exercise. Spiritual energy is derived from one's mind, and more can be created by studying and meditating. As one grows sharper physically and mentally, they are able to produce and possess more powerful chakra in greater amounts. At any given time, a ninja can only have a maximum, but it is possible to increase this limit slowly. Chakra is unique to every individual, giving off signatures and colors which can be perceived by sensory skills and ocular abilities, like the Sharingan. While most forms of Ninjutsu, ninja techniques, require chakra, some do not, such as Taijutsu, which are solely based on hand to hand combat. Though, some Taijutsu can be enhanced by chakra.
Chakra circulates throughout the body, in the same way blood does as its pumped by the heart throughout the body. It moves through what is known as the Chakra Circulatory System, and there are specific points on the body where it is released to perform techniques. These points are called Tenketsu, and there are 361 on the body. Now, chakra is used for all kinds of purposes. The most simple of which includes channeling it to the hands or feet, allowing one to perform feats such as standing on water, or clinging to the side of a tree or wall. For more complex feats involving chakra, handseals are required to assist the user in the moulding and manipulation of chakra, until it becomes easier. As I said before, it comes with training and exercise.
There are two kinds of ways to manipulate chakra. The first is Shape Manipulation. This involves controlling the basic shape and movement of this energy, shaping and it to suit your needs. For example, chakra is normally shapeless, as it is simply energy, but I can shape it to resemble a ball. The second type of manipulation is known as Nature Manipulation, and this is involves changing the properties of chakra itself to resemble natural elements that you see in the world, such as fire or wind. There are numerous elements that exist, each nature bestowing different qualities and capabilities upon chakra. Fire, naturally, is an element that bestows heat and a somewhat explosive nature. The nature of Wind can make chakra into blunt weapons or sharp blades. Water can create concussive and overwhelming torrents. Earth can create sturdy defences and solid weapons from the earth itself. Lightning is able to destroy and electrocute. I shall explain how these abilities interact and the implications of their nature later during our lesson. These elemental natures can also be combined in order to form entirely new natures. An example would be combining Lightning and Earth to create Blast Release, or Fire and Lightning Release to form Dark Release. Outside of the elements, there also exists the ability to use your chakra to induce illusions on people, known as Genjutsu. These illusions work by interfering with an opponent's brain function and chakra flow, making them see or feel certain things which aren't actually there.
There are two other types of chakra, additionally. Sage Chakra, and Tailed Beast Chakra. Sage Chakra is a form of energy that does not come from the body, but instead, flows throughout the world itself. Very few are able to train themselves to absorb and harness this energy, but it is particularly powerful, and grants benefits that normal chakra does not, and allows its wielder to utilise abilities that are otherwise not possible. It bolsters the user's natural abilities, such as their strength, speed and senses, and can increase the power of their techniques. Tailed Beast Chakra is chakra that is found within beings that were born of Yin-Yang Release. When Kaguya, the first wielder of chakra, went insane, she assimilated the God Tree and became the first Tailed Beast. When she was defeated, Hagoromo split this original Tailed Beast into nine individual creatures. The chakra possessed by these beings is insurmountable, and can be used to devastating effect. In a similar way to Sage Chakra, it can be used to benefit it's user if utilised in a certain way, but it is also particularly volatile by its very nature."
Sighing, Ozymandias takes a moment to gather himself after a lengthy period of speaking. He also allows Kirito a brief pause, so that he can properly process the information.
"Are there any questions? If not, I shall move on."