The Kolad Shards

Wave of Oblivion

6-level Enchantment

A target creature you can see within range reppresses all episodic memories for the duration unless it succeeds on an Intelligence saving throw (a creature immune to the charmed condition is also immune to this spell). On a failed save, the target forgets all episodic memories it had when the spell was cast; the target retians its proficiencies and abilities, but not its own relationship to any creature or thing in the world. Friend, family, enemies, and associates seem to be utter strangers, and the target recalls only things it would have considered common knowledge about them (GM's discretion). Each dawn the affected target makes an Intelligence saving throw, ending the spell on it on a success.
At higher levels: When you cast this spell using a spell slot of 7th level or higher, you can target an additional creature for each level above 6th. The creatures must be within 60 feet of each other when you target them.