Magic Signal

Magic Signal (魔法衛星放送, マジックシグナル, Majikku Shigunaru Literally meaning "Magic Satellite Broadcasting") is a spell derived from the use of a Magical Aura, and is a common method for most mages to sense the presence of other people.

Description
The Magic Signal works through precise control over one's magical energy, although it doesn't need to be exceptional. Most ordinary mages are able to utilize this spell with enough training; about a week of intensive training. The spell takes focus by exerting one's magical aura in precise pulses, therefore increasing their overall radius several meters beyond what one would normally achieve when exerting their power. While they exert their power in pulses, the overall essence remains with the user of the spell. The effect of the spell takes place following the interaction of these pulses with a source of magical energy. This interaction signals the user of their presence, and allows them to appropriately respond. However, an obvious backlash is exposing their own selves while using the spell, consequently causing tension among mages who utilize the spell and whomever it encounters. For this reason, most opt to only use it when in a hostile environment.

An additional benefit from training the Magic Signal is for the ability to estimate the quantity and quality of an individual's magical energy after having the pulse encounter with them multiple times. In turn, an individual is able to give an approximation to their emotional state and the level of threat they are facing with, allowing for an appropriate preemptive strike if necessary.