I have made an elental system that can be used in any RP whatsoever..! Here's a hand drawn diagram used to show how it looks.
http://i27.photobucket.com/albums/c170/ ... ensive.jpg
To better explain this, I will elaborate into what these central elements mean.
Anemo: Many know it for wind or such, but it's reffering to energy and motion in general. It can pretain to wind, electricity, light, and so forth.
Terra: All forms of matter. Be it sediment rocks, metal, or anything thing.
Thermo: Any tempurature based reaction, be it hot or cold. It can make a range of things, like fire, or any cold reaction. I can't really think of such a reaction that doesn't use matter and involve being cold.
Those are always combined to use a certain spell. Like for instance, to cast fire, it requires three things. Heat, fuel, and reaction.
Anemo: Friction of the matter.
Terra: Oxygen being the fuel.
Thermo: Heat at which the fire is held at.
Now for all of this to occur, it requires the energy in the air to draw the oxygen together, thus causing it to condense and cause friction. While the firction increases, so does the heat stemmed from the energy and thus gets to a grade at which fire is produced. Now depending on how powerful the user is determines the magnitude of the spell.
The way how this is measured is through Kataga. There are also two types of Kataga measurment. eK and iK. eK is external Kataga. eK is measurement of Kataga from an external source such as an environment with a high reading of natural energy. Holy grounds of religious signifigance in some religions hold such a power, hence that holy vibe man get at a temple or church.
iK is the measurement of internal Kataga. iK is the energy found within a living being. Every lifeform has Kataga to some degree. An average human cannot tap into kataga and demonstrate it in the form of spells. The average Kataga reading in an average human is 8.0046 iK. A person capable of using Kataga in a spell must have a reading of 12.6003 iK. Though very rare to see it used in a spell, it is possible with that reading. It would be very small and not easily seen. Also it being nearly impossible to summon enough power to use it.
For one to be pro-efficient enough with it to cast an average spell, your reading would have to be at 20.7553 iK.
To increase one's iK, one must build up focus enough to meditate and reflect. After much time doing this, one can actually increase their iK. This is a slow process, but can also depend on the environment at which you're in. The greater the eK in the area, the easier it is to focus or use Kataga.
(More will be explained later in an Edit.)