Through learning the five Dragon Styles they didn't learn to wield Celestial Power which was beyond them but could channel the power of the earth itself. Through this they regained the lost power of the Elemental Dragons. Hence the names. The Form Charms- becoming the Dragon is a way to gain it's powers. All the Charms are explicitly Terrestrial Charms rather than Terrestrial martial arts (which is merely a category of their potency.) They can only be learned by Terrestrials and others who can learn Terrestrial Charms. Elementals are excluded because they are mere fragments of the Dragons' power and grow on their own. Terrestrials still carry the blood of the Dragons and are the only ones who can resurrect their power as the Immaculate Dragons once did. The Philosophy of the Immaculate Order believes that the Dragon-Blooded can carry out the Creation ruling Mandate on their own by restoring the power of the Elemental Dragons. A power that was thought long lost and mythical for much of he First Age. But the Immaculate Dragons rediscovered it and started to study it's secrets. The Immaculate Dragons were themselves beings of incredible power that is beyond more worldly Terrestrials. Each one of them had devoted themselves to restoring the power of the Elemental Dragons long before the five Dragon Styles were created. Because of the absolute dedication to their purpose they were able to live long enough, living under changing fake identities to conceal their power, to raise their Essence to a height that could match the Solars. All Immaculate Monks aspire to their adherence to virtue and steadfast purpose. They don't seek power for the sake of being mighty as other Terrestrials do. However no one has mastered the five Dragon Styles since the Immaculate Dragons. Each one is written on a scroll kept at each of the five Immaculate Temples. Only their dedication to overthrowing the Solars kept them alive long enough to raise their Essence that high that they could achieve the supreme power of the Terrestrials, something that was thought impossible in the First Age and came as a great surprise to the jaded Solars. Immaculate Abbots stress the importance of Virtue as a way of attaining mastery of oneself. A practise that other Terrestrials would have a hard time mimicking. Everyone becomes an Immaculate Monk for a reason. Sometimes it's simply to find a purpose.
Obviously not my best work but it's still lays some ground work for future writing and storytelling like a pupil who might finally learn one of the Dragon Styles again.
