Reiatsu, Reiryoku, Reishi System

Reiatsu is the physical force/pressure that a person’s Reiryoku creates when released. Most Shinigami and Arrancar, even Quincy and Bounts can manipulate the release of their Reiatsu.

The difference between spiritual pressure and spiritual energy is simple: Reiryoku is the amount of energy a being has stored within their body or soul, whereas Reiatsu is the pressure that a person’s Reiryoku exerts. In other words, Reiryoku is potential while Reiatsu is energy in use and can be sensed by other spiritually aware beings. In general, those with high levels of Reiryoku will often have the highest levels of Reiatsu also. A skilled warrior can overcome a person possessing greater Reiryoku by possessing greater Reiatsu. This is achieved by having greater control over their own spirit energy.    

Reiryoku is a power aligned with the spiritual sensitivity and willpower of the user. It is used by Shinigami and other spiritual beings to provide power for their various abilities.

Every spiritual being and every Human has a certain amount of Reiryoku. If this amount is higher than a certain degree, it grants the person superhuman abilities. Those with such an above-average level of Reiryoku are very rare among living Humans. It seems to be that the most basic ability that Humans with a higher level of Reiryoku have is the ability to see ghosts: Pluses, Shinigami and Hollow alike. Shinigami are essentially souls in Soul Society with very high levels of Reiryoku who receive special training to utilize their powers. Hollows and other spirits use their Reiryoku to catch their prey.      

Reishi is the main component material of souls. Reishi composes the spiritual bodies of Hollows and Shinigami, and the two planes of existence, Hueco Mundo and Soul Society in their entirety. Reishi is invisible to mortals, with the exception of spiritually aware ones such as the Quincy; they can, however, still interact with normal matter and produce physical effects. It is noted, however, that Reishi and atoms do not mix well.

There is a certain amount of Reishi in the Human World, too. Free Reishi tends to be found in places closer to nature. Quincy collect this Reishi to use for combat in the form of Spirit Weapons. Reishi in the atmosphere is also able to be controlled freely, allowing a person to gather it under their feet so that they can stand in air.

Reiatsu Cost (RC)
Reiatsu Cost is the cost certain techniques take from a user's over all Reiryoku pool. Each level of technique, depending on its abilities takes a certain amount of

• E-Rank - 2 CC
  
• D-Rank - 5 CC
  
• C-Rank - 10 CC
  
• B-Rank - 20 CC
  
• A-Rank - 40 CC
  
• S-Rank - 80 CC
  
• S-Rank Kinjutsu - 120 CC
  
• S-Rank Factor - 144 CC