Blade has immortal flesh due to a curse, and if he were to lose consciousness through what would cause death for a normal person, his body would repair itself until he woke once again. Only legendary weapons can put a dent in his skin, for if he's impaled by even the strongest blade he can pull it out with no injury. Jingliu's sword is the only weapon known to be able to "kill" him, but as written, this won't be permanent. His skin never goes cold, his heart never stops.
He's a Stellaron Hunter.