Horn of the Azure Sea

This magic horn was originally created by an evil cleric. This magic item functions only at night on the open sea. As a Magic Action, you can blow the horn and a Huge ghost ship appears in an unoccupied space on the sea within 360 feet of you. Each creature other than you and your allies that can see that ghost ship must succeed on a DC 19 Wisdom saving throw or has the Frightened condition for 1 minute. The ghost ship disappears after 1 minute or earlier if you dismiss it as a Bonus Action. When the ship disappears, the condition ends on the affected creatures. Once you use this property, you can't use it again until you finish a Long Rest.