Assassin's Burial

Hiding in plain sight is something all the best will boast of, but few can conceal the results.
You touch a single corpse that died within the last hour, and imbue it with a foul enchantment. If a creature discovers the corpse that was unaware of it when the spell was cast, they must make a Charisma saving throw. If they fail, they are frightened of the corpse for one minute and will attempt to move so that they can no longer see it. If the subject attempts to reveal the presence the corpse to any other creature, they immediately forget that they have detected the corpse for one hour. Each time this happens, the target can make a Wisdom saving throw. If they succeed, the spell ends after this instance of temporary memory loss.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the duration of the spell increases by 1 week per spell slot level above 1st.