The Flying Immortal Body, as one of the Twelve Immortal Bodies, was in no way inferior to any other! For a Cultivator, once they completed the Cultivation of the Flying Immortal Body, it meant their speed was Wudi.
If one's speed was Wudi, then Cultivation Techniques and treasures all became unimportant, because you could never catch up to your opponent's speed. You would be slain before you even had a chance to act.
Once the Flying Immortal Body reached Great Success, it could traverse any space. What was even more frightening was its ability to stop Time! Just imagine, how terrifying would a person with Wudi speed be? If they could also stop Time, they would be even more terrifying!
Thus, once a Flying Immortal Body reached Great Success, basically no one in the world could kill its user. Someone once commented that for a person with a Great Success Flying Immortal Body, aside from Time itself, no one else in the world could ever kill them.
