How did I, a fake bodyguard, become a terrestrial immortal?

Lu Yang transmigrates to a martial arts world, starting without any martial arts skills, but is bound to a Super Escort System. As long as he completes escort missions, he can obtain various martial arts rewards.
[I've acquired the Eighteen Subduing Dragon Palms!] How can someone with no cultivation level engage in a battle of energies with another?
[Achieve the Xuanwu Zhenyue Body!] What does it mean that even a terrestrial immortal cannot break through its defenses?
Wait a minute! My skills seem to be all at the conceptual level!