Silent Caster

Level: 2
Duration: 1 round
Saving Throw: None (normal) or Will negates (reverse)
Normal: Your ally can cast spells without making a sound, the verbal component instead appearing as sigils of power.
You grant your target the ability to apply the effect of the Silent Spell feat to any spell she casts without increasing the cost of the spell. Glowing runes appear above your target’s head that take the place of the verbal component of the spell.
Reverse: An enemy creature is unable to speak or make a peep, its vocal cords completely stilled.
You silence your target, making it incapable of producing sound, conversing, or using spells with verbal components. It automatically succeeds on Move Silently checks.