Evocation

Evocation is a flashy form of magic that has fires, explosions, etc. First mentioned in Storm Front.

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

In the Series
In Storm Front, Harry tells Murphy and Ron Carmichael the two possible ways that the murder victims, whose hearts exploded out of them, could have been killed by magic: Evocation or Thaumaturgy.