MAGIC TERMS:

Line of vision

Line of vision means that the mystic's target/victim must be within their sight (line of vision) to be affected. If the target is not seen, is totally obscured by obstacles, darkness,invisibility, or just not seen by the spell caster (hiding, behind them, beyond normal vision), the magic can not be used. However, some line of vision spells can be directed in a specific area that the spell caster can see to affect someone invisible or hidden.