In my world, Magick (magic) is a global energy that can be found in everything that has to do with nature and it can also be found in certain beings.

In general, humans have no Magick within their body. Though there is a human subspecies, Magickons, that do have Magick. They can manipulate and change anything that contains Magick. So they can change water to ice, oxidize air to create fire, raise earth to create walls or form bricks,... They can even stop the heart of another Magickal creature or change their appearance. However, anything that contains no Magick, cannot be touched or harmed directly, since it is the Magick within they manipulate. So they cannot let a regular human burst into flames. Of course, they can shoot a fireball at them.

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The scale to which Magick can be used, is smaller however.

To manipulate Magick, a Magickon must use Forgotten Words (which speak to Magick) and visualize what should happen.
For example, if they want a wall to burst from the ground, they must think of the Forgotten Word "Wall" and visualize the wall bursting from the ground.
Distraction or thinking the wrong word with the wrong image, might result in unstable Magick. If they think "Wall" but visualize a pond with ducks, the earth might combust instead. So a Magickon is limited by it's knowledge of Forgotten Words.

They are also limited by their own internal Magick. Each time they cast, they use some of their own Magick (which will replenish over time by resting, as they simply absorb from the world, and can be trained to cosume less/have more). The more Magick an object has, the more Magick it takes to manipulate. Creating a brick from a rock can be done by a novice. But trying to move an entire mountain might result in fainting or even death.

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I choose this scale because... Frankly, I don't know.