Phantasmal Killer

You tap into the nightmares of a creature you can see within range of the spell and create an illusory manifestation of its deepest fears, visible only to it. The target must make a Wisdom saving throw. On a failed save, the target becomes Frightened for the duration of the spell. At the end of each of the target’s turns, before the spell ends, it must succeed on a Wisdom saving throw or take 4d10 psychic damage. On a success, the spell ends.

At Higher Levels. When you cast this spell by spending Mana points equal to a 5th-level spell or higher, the damage increases by 1d10 for each level above 4th.