Intellect-Increases your mana and if you get it up to 200 you get a title
Stamina-Your ability to preform an action.
HP-Health. If it is reduced to 0 you are K.O.ed. You have a few options at that point.
- Revive in town.
- Revive right there.
- Ask Nao (only if you have Nao's help, e.g., a Nao Soul Stone).
- Wait for rescue.
Keep in mind the choices are different when in a dungeon.