Evocation

Evocation is the Art of evoking a reaction to get the result desired. This done through this method of idea. Make a link to some source by imagining the source and yourself as stick figure drawings. Now imagine a line to yourself from the source you chose. This source must not be human! This also cannot be corrupted. I would choose the sun. . The earth is the other choice of mine. Now find a concept in your mind that you want to have happen. Make the concept happen by imagining a hand that scoops up the source. Imagine said hand charged with the purpose of making things happen to your purpose by evoking the right reactions. Thank the source after you are done and dismiss the hand mentally. Evocation is the simplest technique.

You can do this effect through a focusing device as well like a ruby for a fireball, a diamond for cold spells and a wand or staff for almost anything.

A fireball is evocation. You evoke the fire from raw fire force.

Ice or freezing effects are simple, take a diamond and focus raw cold force through it. Now when the cold gets notable as freezing, try to make imagination focused through the gemstone of what type of cold effect you would want to happen and to whom or what. Try also to focus on the target. Now, mentally release the ice force contained in the diamond. Watch it do exactly as you imagined it.

Air is also an evocative force. All it is is taking a compressed force of air to make a puncture in the target.

Mentally imagine a concept of something doing something and it will Same thing for a person.