Ghastly Charge

You call forth the spirits of long-dead knights, which charge forward from you in a 90-foot long, 20-foot wide Line, and then vanish. Each creature of your choice in the Line must make a Wisdom saving throw. On a failed save, a target takes 5d12 Necrotic damage, has the Frightened condition until the start of your next turn, and must immediately use its Reaction, if available, to move as far from you as it can, using the safest route. On a successful save, the creature takes half as much damage only.

Using a Higher-Level Spell Slot. The damage increases by 1d12 for each spell slot level above 6.