Amnesia

You target one creature within sight that is known to you. The creature makes a Wisdom saving throw, taking 3d8 Psychic Damage on a failed save and only half as much on a successful one. The character suffers from amnesia. The character knows who he or she is and retains Racial Traits and Class Features, but doesn’t recognize other people or remember anything that happened before the spell took effect.

At higher levels the spell lasts either 24 hours longer or targets an additional creature for each spell level.