Brainkill

As an action, you can attempt to erase a creature's memories. The target rolls an Intelligence saving throw. If it succeeds, the spell ends. If it fails, the target takes 1d6 psychic damage, and you can choose one person, place, event, or a year, to be completely erased from the target's memory.

The target retains any skills it has, even if they were learned during a period that was erased by this spell. The knowledge affected by this spell can be re-learned, but not remembered unless a remove curse or greater restoration spell is cast on the target to restore the memories.

Regardless of the result, the target knows their mind has been tampered with.