Evocation

Evocation magic is what Cookie describes as "your magic words." It is the art of taking in willpower and then releasing it using a magic word to give it a purpose and intended effect. It is the most common form of magic. In "Cookie's Monsters," evocation magic takes on the same form as it does in Jim Butcher's "The Dresden Files."

From The Dresden Files
Evocation is the most direct, spectacular, and noisy form of magic, or sorcery. It can only happen in direct line of sight. The evocator would have to be in the same room as their victims.

This type of magic is what is mainly used in direct combat situations. The ability to use it without ritual allows more focus on combat than anything else. It usually works best with a focus depending on the skills of the wizard. While it takes a while to learn a new evocation, it has the advantage of being able to be used on the fly.

Harry Dresden calls it "Quick and dirty" magic. It draws directly from the wizard's will and is turned loose without benefit of a guide or limit. It is dangerous and difficult. It is useful for throwing around a lot of energy.

Harry does not consider himself good at evocation because he does not have a lot of finesse. There are few who can control it properly and reliably. Donald Morgan was one of deadliest evocators in the world.