Children of the Divine Order
Evocation is the quick-and-dirty method of using power; it’s basically the art of slinging magical energy around more-or-less directly. If the wizard has a high level of control, evocation can be efficient and deadly. If he can’t control it, then it’s inefficient, but still very possibly deadly to everyone.
In evocation you gather your power then shove it into a temporary construct of will to control its direction and effect. This covers magic such as the simple point-and-blast. It is quicker but less certain than Thaumaturgy, and it doesn’t need any physical constructs to assist it. Though certain tools like staves, rods, and wands can help direct the energy and increase focus. If you try to draw too much power or can’t focus sharply enough on your virtual construct, then the release of energy shatters the construct inside your mind resulting in unconsciousness (or worse) or breaks loose on the physical plane, expending more power and creating a much more dramatic effect than planned.
You can’t use evocation to affect anything beyond your line of sight. It’s hard enough to concentrate on holding the mental construct for the spell together; if you have to concentrate on a second spell to find your target it’s just too much all at once. Also, magical energy can only travel a certain distance before you need a more permanent construct to direct it accurately and that’s the kind of thing you need Thaumaturgy for.
Evocation also has a very short duration, usually limited to an instant. While it’s possible to keep certain evocation effects working for a little while by continuing to feed them power, even this will only work for a limited time. Long-lasting magic is the province of Thaumaturgy.
Evocation can be used to overcome obstacles usually by simply blasting through them. It lacks the subtly of other forms of magic for pure directness. However when all one has is a hammer everything looks like a nail.
Particularly adept users may be creative enough to use a massive gust of wind to launch themselves over a chasm or some other equally creative idea, however this tends to act more like attacking yourself with a vaguely useful effect involved. In the case of the gust of wind it may get you over the chasm, but then you will crash into the ground at the other end with full force.
Create an Advantage
Evocation cannot generally be used to create an advantage. A adept user may manage something like targeted damage to the victim, but that’s about as indirect as it tends to get.
This is the most basic and straightforward use of evocation, and maybe the best known. The image of the wizard tossing around fire and lightning is deeply entrenched in popular culture. The Will roll to control an attack spell also counts as the attack roll.
Shielding effects are another very common application of evocation; the next best thing to causing damage to others is avoiding it yourself.