Battle horns

From Sword of Truth Wiki

Battle horns are a conjured magic created to counter the Shadow People that were created by Panis Rahl in the war between D'Hara and the Midlands. The Battle Horns were created by Zeddicus Zu'l Zorander and when they were blown they would sweep the Shadow People away like smoke on the wind. These Battle Horns were the first of its kind used in at least 3,000 years. The first Midlands unit to use the horns were under the command of General Brainard near the Kern River, against a D'Haran unit led by Urdland.