A Useless Dragon Priest? What About Being the Master of the Dragon's Nest as Well?

[National job change + commanding the dragon + concurrent BOSS + invincibility + no suppression + super fast upgrade] With the nationwide job transfer coming, Lin Qing awakened the top hidden professional Dragon Priest. But the dragon is noble and powerful, and it is impossible for a poor person to obtain a dragon pet. Fortunately, I got the dungeon BOSS concurrent system, the first concurrent dungeon "Abyss Dragon Valley"! Lin Qing transforms into the Red Dragon King and kills the intruders, instantly gaining a massive amount of experience and maxing out his level! What should I do if I don't have a dragon pet yet? He turned to look at the red dragon egg that was still one day old in the dragon's nest... "Ding! Dragon pet Xiaohong kills the poisonous spider king, gains 666666 experience points, and obtains dropped items..." "Ding! Dragon pet Xiao Hei kills the Holy Flame Knight, gets 999999 experience points, and gets drops..." ... "Ding! Congratulations to the host for conquering the Abyss Dragon Valley and reaching the highest level!" Many years later, Lin Qing contracted with tens of thousands of giant dragons, commanded hundreds of millions of legions, and raised his arms and the earth trembled. Looking back, the poor boy back then was already invincible in the world.