The practitioner's Dan energy originates from the moon sun and five elements, the body has five elements, since all living things have the five elements, regarding the issue if humans can train the Dan, there are two main views: one party believes using people will result in many difficulties, thus they only use the elemental energy from external sources, they are called true practitioners, the other party believes the body is the supreme thing under the heavens, in order to increase their strength exponentially, they use other people, they are called nefarious practitioners. True practitioners and nefarious practitioners' battle, is now unfolding!!!