In this type of lesson, for dragons to evolve into any body form, it needs to complete Five different soul tiers.
The first soul tier is the Normal Dragon Soul, which is common to all dragons. The second soul tier is the Draco Dragon Soul. And next, the third tier is the Dracotaur Dragon Soul, the forth tier Dracaves Dragon Soul, the fifth tier, Dragon Soul (but this has many branch of evolution. For example, Fire Dragon Soul, Ice Dragon Soul.. etc.), the sixth tier, Legendary Dragon Soul, the last tier, seventh tier, Humanoid Dragon Soul.
The Dragon knights have a privilege of learning this lesson but it is minimized to only the second soul tier. In this case, the dragon knights are capable of transforming into a lower tier Dragon, unlike the royalty Dragons.
