Night Guy is a taijutsu technique this used as a last resort because once you use it you most certainly die. there are multiple reasons for this. the first reason is that it requires the user to open the gate of death, which is the Eighth and final gate, located at the heart. to perform the technique, the user charges his chakra while taking a stance. as he charges the chakra he emits a red chakra from his body with takes the shape of a dragon. from there the user dashes at the opponent at x8 the user's base speed, which also a speed that causes the user to bypass the opponent's defenses because the distortion in space he causes from his own sheer speed. The user then deals a powerful kick that can completely obliterate the target and can create a shockwave linear from the kick which could destroy the opponent from a distance, also making it a powerful ranged attack. unfortunately the pressure from the attack is so immense that is completely shatters the users legs in the process and afterwards the users body disentigrate into dust because of the intense chakra emitting from his body, kinda of similar to what happened to Naruto's hand when he used the Wind style: rasenshuriken against Kakuzu and his hand was damaged but on a grandeur scale.