Rejuvenation (Su): In most cases, it’s difficult to destroy a ghost through simple combat: The “destroyed” spirit will often restore itself in 2d4 days. Even the most powerful spells are usually only temporary solutions. A ghost that would otherwise be destroyed returns to its old haunts with a successful level check (1d20 + ghost’s HD) against DC 16. As a rule, the only way to get rid of a ghost for sure is to determine the reason for its existence and set right whatever prevents it from resting in peace. The exact means varies with each spirit and may require a good deal of research.
