The Wild Hunt (spectral hunters version)

With a deep resonant call you blow upon your hunting horn as you present your gifts for the fey spirits. The sound of other hunting horns and baying hounds soon join in as the veil splits and the hounds and hunters of the Feywild join your call to hunt. 

Any creature within 30 feet of you on the turn that you cast this spell must make a Wisdom save or become Frightened until the end of its next turn.

At the start of the next round the hunters appear as a line of spectral hunters 30 feet long and 5 feet deep (appears as a mixed line of fey elves and elven hunting hounds) with the caster in the center of the line. (extends 15 feet to both the left and right of the caster.) The line of spectral hunters moves along with the caster who is immune to the hunters fear and damage effects.

Any creature that starts its turn within 30 feet of the spectral hunters must make a Wisdom save or become Frightened until the start of its next turn, when it can retry the save if still in range. A creature that makes its save is immune to this effect for the next 24 hours. 

The Wild Hunters are incorporeal and can occupy and pass through the spaces of other creatures. Anyone that passes through or is passed over by this line takes 3d8 force damage. A creature can only take this damage once per round.

At Higher levels: When cast using a spell slot of 5th level the line of hunters extends to 50 feet and the hunters deal 5d8 force damage if touched. At 7th level the size of the line increases further to 70 feet, and the force damage increases to 7d8. At 9th level the length of the line increases to 90 feet, and the force damage increases to 9d8.