Power source

A wizard who functions as the "engine" of a spell, allowing others to handle the wizardry's strictly structural functions while devoting him-, her- or itself to simply supplying the spell with the power it needs to execute. This is a role which (by those insufficiently experienced) is sometimes thought of as work for the less skilled wizard. Nothing could be further from the truth. Knowing how much power to feed a spell, exactly when, and for how long, is routinely a business as complex and difficult as the construction of the wizardry itself -- and additionally tends to require a wizard largely, if not completely, immune to the demands of ego.

See also: Spells, power management.