There are three categories of skills mind, body and soul and passive and active for each. Levels there are 13 grades of skills.

  Low, Mid-Low, High-Low, Low-Mid, Mid, High-Mid, Low-High, Mid-High, High, Low-Godly, Mid-Godly, High-Godly, True-Godly.

  Esper skills are skills that depend on the energy the mind holds.

  The type of energy limits the type of skills you can learn and use such ki would limit your use of mind and soul techniques.

  Ex. A ki user would stop you from using techniques from the mind and soul section that involves an energy from that category.

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  Ther are also unique skills that only have one level or two and might depend on your stats, skills, stat of mind.

  The skill of seven sins wrath depends on how angry you are to determine the increase of power.

  There are techniques for the Mind, Body, Soul, and a mix of them. Martial Arts are body technique. Pain nullification has two variants the mind and body one and only one complete level. Soul devour is a skill that allows you to eat souls, and use part of it to nurture your own and the rest is discarded, but as long as the time isn't too long the soul will return to the body with some memory loss or in a coma.

  Races have different starting places and different basic increases in stats and skills.