How to synthesize the legend fragment of Douro Continent 3 Dragon King?

In the godhead system, a certain number of fragments can be consumed to light up various constellations. According to the brief information of the query game "Legend of Dragon King in Douro Continent 3", in the game, the fragments are synthesized in the godhead system. When the character reaches 13 level, the godhead system will open. By consuming godhead fragments, you can light up various constellations. Lighting constellations can increase the combat attributes of all soul divisions in the battle, and some constellations can get rare props by lighting them.