HornOfSummons
From Exalted - Unofficial Wiki
Horn of Summons (Artifact 1) These ornate horns, usually carved from great ram’s horns or elk antler, are one of the tools that help hold the Silver Pact together. By committing a single mote to the horn, any number of beings may attune to the horn, allowing them all to hear the horn sound, no matter how far away they are at the time. The horns are often used by Lunar packs separated by vast distances to call on allies in times of need. To sound the horn requires the Exalt to spend 5 motes and blow the horn for a full three turns. All the motes previously committed to the horn immediately flee to their originators, carrying the sound of the horn in their wake.