Illusion
From Ardrana
Illusions are spells that deceive the senses or minds of others. Spells that cause people to see things that are not there, hear noises not made, or remember things that never happened are all illusions.
Note: Illusion as described here originally appeared in the 2nd Edition Player's Handbook for Advanced Dungeons & Dragons from TSR. Its use here is for the purposes of providing context for the campaign only.