One use only. The bearer of the Horn of Kygor can sound it at the start of any of his Movement phases. If he does so, all friendly monsters, monster mounts, monstrous beasts, monstrous cavalry mounts, cavalry mounts, chariot beasts and war beasts within 12" of the bearer have the Frenzy special rule until the start of their next Movement phase. Note that the Horn of Kygor has no effect on riders, just their mounts.