Call of Nezekah

You imbue a weapon you touch with power granted from the Abyss. Until the spell ends, the weapon emits a deep purple light in a 30-foot radius and a cacophony of deep cries and tolling bells within 120 feet. In addition, weapon attacks made with it deal an extra 3d6 cold damage on a hit. If the weapon isn’t already a magic weapon, it becomes one for the duration. As a bonus action on your turn, you can dismiss this spell and cause the weapon to emit a burst of abyssal energy. Any creatures of your choice within a 15-foot radius must a Wisdom saving throw. On a fail they take an additional 3d8 cold damage and are frightened. On a success, they take half damage and are not frightened.