Delayed Phantasm

Choose a point within range. This spell creates a phantasmal object, creature, or other phenomenon at that point that is no larger than this spell's area. When a creature comes within 20 feet of the point, the phantasm, appears and illusionary force ripples outwards. Each creature in a 20-foot-radius Sphere centered on that point makes a Wisdom saving throw. A creature takes Psychic damage equal to the total accumulated damage on a failed save.

The spell’s base damage is 6d10, and the damage increases by 1d10 every dawn if the the spell hasn’t ended. The maximum psychic damage is 15d10. 

Using a Higher-Level Spell Slot. The base damage and maximum damage increases by 1d10 for each spell slot level above 6.