Wit's End

House Dimir
Level 7
Casting Time: Action
Duration: Instantaneous, Lingering 24 Hours
Range: 30 ft (?)
You unleash a wave of virulent mind energy upon a target in range. They must make a Constitution Save. On a failed save, it takes 14d6 necrotic damage, or half as much damage on a successful save. The damage can't reduce the target's hit points below 1. This wave of energy is such a shock to the system that creatures that fail the save by 5 or more, until the spell ends, they cannot remember anything that happened in the last 24 hours and are immune to any effect that would sense its emotions or read its thoughts, as well as divination spells, and the charmed condition.