The Wheel of Time is a massive world that is arguably one of the most in-depth fantasy worlds in literature. On top of the deep history of the Westlands and the multitude of cultures and civilizations, The Wheel of Time also has countless powerful artifacts. Some help the user to draw upon the One Power, while others help the user enter whole new realms. Yet, one of the most powerful is the Horn of Valere, and the role of this Horn has finally been revealed in the Season 2 finale.
Source：https://www.cbr.com/the-wheel-of-time-horn-valere-explained/
