You perform dark incantations over a small depiction of the target of this spell. The target must be a creature who you know by name, and who shares at least one language with you.

When you cast this spell, the target must make a Wisdom saving throw, against your spell save DC. If they fail the spell has no effect, and you will know immediately that it has failed. If you succeed, the following effect takes place.

The next time this target awakens from being unconscious, they are under the impression that you have been their lifelong best friend, and their memory is changed to feel that that has always been the case. Every time that something happens to the target that conflicts with the idea that you have always been their best friend, they must make a DC 20 wisdom saving throw. Each consecutive time that another thing happens, the DC decreases by 1. If they pass the DC, the DC reaches 0, or Ten Days pass, the memories fade, and the target known that they have been under the effect of a spell.

Once you have cast this spell on a creature, you can no longer target them with that spell.