Health points(or HP) tell how much health your Mechatar has. During a battle,attacks will lower the amount of health your Mechatar has. When it gets to 0 or lower you will lose the battle. After a battle, a Mechatars health will be restored back to the regular starter. There is an upgrade that will increase your health depending on how much damage your attack deals(Stabilizer)and there is an attack property that increases yours(Siphon) and another that decreases yours(Berserk) and another that decreases your opponent's over time(Burn). There are also medals that come when you push your opponents HP below 0.