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.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.