Here we go...
Keen of Despair (Su): A resident can unleash its keen as either a 60-foot cone or 30-foot spread centered on itself. Creatures in the area must succeed on a DC 17 Fortitude save or become paralyzed with fear for 1d6 rounds. Once a resident keens, it must wait 1d4 rounds before it can do so again, and it can keen no more than three times per day. This is a sonic, fear effect. The save DC is Charisma-based.
Rejuvenation (Su): In most cases, it’s difficult to destroy a resident through simple combat: The “destroyed” spirit will often restore itself in 2d6 days. Even the most powerful spells are usually only temporary solutions. A resident that would otherwise be destroyed returns to its old haunts with a successful level check (1d20 + resident's HD) against DC 16. As a rule, the only way to get rid of a resident for sure is to confront it with evidence that its surrogate does not wish it around, and then cast an atonement spell upon it.
Vulnerability to Remove Curse (Su): A remove curse or break enchantement spell cast upon a resident destroys it immediately unless it succeeds on a Will save. The resident will rejuvenate as normal if destroyed in this manner.