Phantasmal Killer

Source: D&D 5.2 SRD Spells

Level 4 Illusion (Bard, Wizard)

• Casting Time: Action
• Range: 120 feet
• Components: V, S
• Duration: Concentration, up to 1 minute

You tap into the nightmares of a creature you can see within range and create an illusion of its deepest fears, visible only to that creature. The target makes a Wisdom saving throw. On a failed save, the target takes 4d10 Psychic damage and has Disadvantage on ability checks and attack rolls for the duration. On a successful save, the target takes half as much damage, and the spell ends.

For the duration, the target makes a Wisdom saving throw at the end of each of its turns. On a failed save, it takes the Psychic damage again. On a successful save, the spell ends.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 4.