During your time in JutsuOnline you will sustain injuries in combat, losing health points (HP). In order to regenerate your health, you will have to visit your respective village's hospital and talk to a Medical Nin at the cost of Ryu.
If your health is reduced to zero and your life is not spared, you will respawn in your village's hospital and lose longevity.
Each technique you perform will be at the cost of chakra. It is important that you conserve your chakra as it can take up to fifteen minutes to regenerate. In order to regenerate your chakra, you will have to use the 'Rest' action which can be found in your Jutsu Book (P). p