Horn of Cernunnos

Horn of Cernunnos is a treasure located underneath the Kingdom of Liones. It is a ritualistic relic that allows the user to communicate with the realm of the Goddess Clan.

History
At some point in time, the Kingdom of Liones obtained the artifact and kept it hidden beneath the kingdom for years. After managing to obtain information regarding its location from an unlucky Holy Knight patrolling the room, Ban seeks help from the Goddess, attempting to revive Elaine in exchange for his own life. However, the Goddess decides to only grant Ban's request if he finishes a mission, which is to slay Meliodas, the Dragon's Sin of Wrath.

Trivia

 * In the "Chevalier de la Table Ronde", Ban is the son of the Gaulois's god Cernunnos who is a great god with Horn.