Haunt is a Venus-based support Psynergy found in both games of the Golden Sun series. It is available to the Apprentice and Medium class series in the first game, meaning that all Adepts, except for Garet, have access to it. The second game adds the Dark Mage class series to the list, making it available to any Adept. The standard level for learning Haunt is 17, it costs 5, has a range of 3 PP and is used to attempt to haunt the foe.
The effects of haunt are inconsistent, causing damage randomly. The low chance of its effect taking hold decreases its usefulness further. The fact that this Psynergy only attempts to inflict the haunt status and nothing else, it is mostly useless. Normal battles don't last long enough for the haunt to do much damage, and it hardly ever works on bosses. When used by an enemy, however, the fact that haunt's effects are difficult to remove (only Salt and Tonic can remove it in battle) and the fact that it can deal significant damage to your Adepts, greatly increases its efficiency.