This more powerful version of the forget spell allows the wizard to actively alter a part of a creature's memory. The portion of memory the caster can affect is limited to one specific event in the creature's life. The memory of a real event can be altered as the caster wishes. The wizard could replace real facts about the event with false ones, or even place a completely new memory into the creature's mind, causing the creature to remember an event that never happened. The caster, however, is unable to remove a memory of an event in its entirety. There is no time limit on how far into the past an event can be altered. The creature is entitled to a saving throw vs. spell to avoid having its memory changed. A heal, restoration, or wish spell cast for this purpose will correct any alterations made to a creature's memory.
Notes: Uncommon or rare spell (WoG).