You whisper words into a nearby shadow, and the darkness carries them away to the person you designate.

Daily   ✦     Arcane, Shadow
Standard Action      Personal

Effect: You whisper a message of up to twenty-five words into a shadow, then choose a creature you know on your plane. (If the creature is your patron, the message is received regardless of planar location.) Only that creature hears the message. If the creature is not on your plane, the message is lost, and you are aware that the message was not received.
    If the creature receives the message, it can respond within 5 minutes with a similar shadow message of up to twenty-five words. Doing so requires a standard action.

Published in Heroes of the Feywild, page(s) 115.