Insidious Domicile (CR 4)

The dwellings of some powerful evil creatures impose pervasive effects on those who disturb the restless hate that dwells within. These areas are typically single structures—a castle, a tower, or a home—infested with spite and malice. Creatures that enter the structure must succeed at a DC 16 Will save or be infected with overwhelming hate toward another creature, as if under the effects of malicious spite. For each day spent within the domicile, the target takes 2 points of Wisdom damage if it doesn’t act to subtly and indirectly slander, abuse, blame, extort, or cause mortal violence against the target of its spite. The malicious spite effect ends if the creature leaves the location, but resumes if the creature returns. Affected creatures get a saving throw every 24 hours to negate the effect. If the effect ends, the target remembers the spiteful behavior, but not the motivation for it.

If your campaign uses the sanity rules, the target takes 1d6 points of sanity damage instead of taking Wisdom damage.