To hatch a Mythical Dragon Egg, you need a Hell Flower as a primer, supplemented by water from Nine Cauldrons prepared into one Cauldron.
If it had been previously, it would have been difficult to hatch this Mythical grade Dragon egg. Nine Cauldrons' water is easy to find, but the Hell Flower is hard to come by.
However, he just harvested a large Hell Flower in the Frontier Wilderness, which was perfect for his needs, thus simplifying things a lot.
Without hesitation, Jiang Hui took out the Hell Flower, brought a large pot, and poured into the pot the volume of cold water equal to Nine Cauldrons. After marking the gradation, he ignited a ball of True Dragon Fire under the large pot with ease.
The True Dragon, as the only one among the Ten Evils that can reach the Immortal King Realm in both spirit and body, has passed down multiple Divine Skills in his bloodline, including True Dragon Fist, Dragon Roar of True Dragon, True Dragon Fire, and so forth.