You have Berserker Physiology The ability to become a massive and unbelievably powerful individual with a desire for battle regardless of one's own physical condition. LImitations include not caring for one's own well being and injuring self in the process, usually an inverse relationship with rational thinking, as your strength and invulnerability goes up, the less rational and intelligent you become. Does not come with healing factor necessarily, at the end of the 'rage' you may have to deal with all the pain and injury inflicted during at once.