Stamina

Stamina is a system which allows the use of Chakra and its components to be measured and deducted throughout a session of role-play. There are two basic components of Chakra, as it is in canon. These components are: Physical Energy, which is directly based off of a character's Constitution, and Spiritual Energy, which is directly based off of a character's Intelligence. When these two things are combined, they create Chakra, which can be used for Jutsu. Because Physical and Spiritual Energy are both directly related to attributes from the Power Score, it also means those same attributes hold a special relation. Unlike other attributes which are unrelated, the numbers between Constitution and Intelligence are actually shared. This means that in total, their maximum can only ever amount to 80 points, the natural cap of all other stats. The explanation for each type of energy, as well as how they work in tandem with one another, can be found below.

Physical Energy
Physical Energy represents just one of the two components that makes up a person's Chakra pool. Your points in Physical Energy mirrors your Constitution points. Aside from this, it is used by Taijutsu specialists and others. Yet it is not strictly for them.

Spiritual Energy
Spiritual Energy is just one of the two components that make up Chakra. Spiritual Energy mirrors your character's total Intelligence points. Spiritual Energy is particularly important to Genjutsu specialists, yet is not restricted to them alone.

Chakra
Chakra is a sub-stat that is directly influence by two other attributes, Physical and Spiritual Energy. This stat represents your character's Chakra pool. The total amount of Chakra points one can naturally attain is taken from the halved values of a character's energies. The total number that a person can have is 80 points, unless they specifically have a condition that allows them to go over that (bloodline, jinchūriki; etc). When performing a Ninjutsu, which requires Chakra, as well as any other technique that does, the user must create some from their readily available sources. This is done by first finding out the cost of the technique, then deducting an equal half amount from one's Physical and Spiritual Energy. In example, a C-rank requires 5 points to use. So, this is split evenly between 2.5 points that is taken from both Physical and Spiritual Energy.

Jutsu Cost
All Jutsu, no matter their type, have an exact cost to them. These are equivalent for all types of Energy used, even Chakra with the method described previously. The exact cost depends on each individual jutsu, but for all canon jutsu they go as follow (unless otherwise specified):


 * S-Rank: 40 points.
 * A-Rank: 20 points.
 * B-Rank: 10 points.
 * C-Rank: 5 points.
 * D-Rank: 4 points.
 * E-Rank: 2 points.

Yang and Yin Release
Concerning Jutsu that make use of Yang and Yin Release, without being purely Taijutsu or Genjutsu. Such as the Akimichi Clan's Multi-Size Technique, or the Nara Clan's Shadow Imitation Technique. Instead of using the usual half-and-half formula as one naturally would for a Jutsu using Chakra, they would instead use 2/3rds of the designated energy in question, while using the remaining 1/3rd for the opposite energy. The resulting number for each side would be rounded up to the nearest half or whole number. In example, the Akimichi's Multi-Size Technique mentioned before. This would use Yang Release, which is also a form of Physical Energy, as Yin is for Spiritual Energy. A C-rank technique costs 5 points to use. 2/3rds of 5 rounded up is 3 points, with the remaining amount being Spiritual Energy.