Eternal Sonata

This techique allows the user to send messages to comrades by using the wind. After activating the technique, the user need only whisper the message into their hand and 'blow' it into the wind. From there, the message is carried on the wind incredibly long distances to its targets.

The message itself is virtually impossible to intercept or stop. Naturally it can't pass through physical barriers, so targets within an enclosed location cannot receive the message.

In addition shinobi with advanced hearing can listen in on the message if it happens to pass by them.