Also known as SP, Sanity Points are one of the most important stats in the Shadow Hearts series. These are measures of a character's sanity during battle. The SP varies for each character, some may have a naturally low amount while others will be rather high. Should the SP of anyone reach 0 during battle, that person will go into the Berserk status. Under this status, characters will behave erratically and will possibly attack the allies of it's own party.
Various abilities and equipment can alter SP amounts. The Dark Angel, for example, increases a character's SP by 20%. A special accessory for Fusionists called the Flare Brooch, can half the SP cost for Fusions. Also the notible abilities of Lucia's Aromatherapy, Tarot Cards and Ricardo's Serenata can effect a character's SP values.