Ackerknock's Annihilation

An extraordinary blast of the powerful goblin mage Ackerknock. Make a ranged spell attack against the target. On a hit, the target takes 20d10 Force damage and must also make a Wisdom saving throw. On a failed save, the target becomes frightened for 1 minute. While frightened by this spell, a creature must take the Dash action and move away from you by the safest available route on each of its turns, unless there is nowhere to move. If the creature ends its turn in a location where it doesn't have line of sight to you, the creature can make a Wisdom saving throw. On a successful save, the spell ends for that creature. A blasted creature that dies can be restored to life only by means of a True Resurrection or a Wish spell.