Mystic Word

Milil, lesser deity of song, gifted you with an ability of supernatural voice. 

While casting a verbal spell, you can choose to make a loud sound as a verbal component. Doing so alerts every creature able to hear you in a range of 30ft., but adds 10ft. to the spells range.

While casting a verbal spell, you can choose to whisper the verbal component to yourself. This does not alert any creature, but limits your spell range to 4ft.