The context: one of our valiant heroes is charged with committing a crime that he didn't commit! However, he doesn't have an alibi, and can't even remember where he was or what he was doing at the time of the crime...
The question: What fantastical methods in D&D 4E are there for tampering with a person's memory? By fantastical I mean excluding drugs/alcohol, blackouts due to unconsciousness etc, and including powers (both monster and PC), rituals, magic items. I am talking about any kind of memory alteration, whether false memories or memory wipes.