HP

From Lost Odyssey Wiki

HP stands for "Health Points" or "Hit Points" in some cases. In Lost Odyssey HP represents your characters life force, when a characters HP is depleted to 0 they will either be knocked out (Immortals) or die (Mortals). If all characters in a selected squad have their HP reduced to 0 then the game is over. This can be avoided by having at least one character alive it can also be avoided with the use of Tolten's Persistance Skill which can be learned through Skill Linking, HP can be regained through the use of items such as Healing Medicine and Healing Tank, characters which are skilled in the use of White Magic can also heal team mates both during battle and from the main menu at the expense of their MP.

The Prayer ability will heal a small amount of HP for no MP cost - due to the low numbers of HP resored, it is of most use near the beginning of the game, becoming irrelevant from the mid-point.

An Immortal will have around 20% of their hit points returned after about three rounds after being knocked out. Mortals do not get any automatic restoration. Both Mortals and Immortals can be restored by the use of Revive, Resurrect or by items - however, this can leave the character low on HP and vulnerable to another attack before they can be healed again.