Não, você não precisa falar nem pronunciar uma palavra para lançar um feitiço de evocação. No entanto, realizar uma evocação sem falar é perigoso e doloroso.
De Fool Moon , capítulo 15, abreviado:
I stopped trying to struggle against the man who was choking me. Instead, I grabbed his wrist and prepared to do something foolish.
Magic is a kind of energy. It is given shape by human thoughts and emotions, by imagination. Thoughts define that shape - and words help to define those thoughts. That's why wizards use words to help them with their spells. Words provide a sort of insulation as the energy of magic burns through a spell caster's mind.
But you can work magic without words, without insulation for your mind. If you're not afraid of it hurting a little.
I drew in my will, my exhausted fear, and focused on what I wanted. Then I ground my teeth together and released my will with a burst of sudden energy.
Two things happened. First, a rush of blinding thought, brilliant and wild and jangling, went through my head. My eyes swam with color, my ears with phantom sound. My senses were assaulted with a myriad of impressions. They were a side-effect of the energy rushing through my head.
The second thing that happened was a surge of electricity gathered from the air around me to my fingertips, gripped on my attacker's wrist, and surged up through his arm and into his body.