I just became an Immortal, and my Descendants begged me to Come out of the Mountain

Reincarnated as the first prince of the Jing Dynasty, Jiang Changsheng was tricked by a traitor just after he was born. He was later sent to a Taoist temple and became an ordinary little Taoist priest.
From a prince to a little Taoist priest whom no one cares about, his life has fallen. Fortunately, Jiang Changsheng has opened the survival system and has an unlimited lifespan. As long as he survives the hardships in life, he can obtain survival rewards.
He was almost accidentally killed by his senior brother during his martial arts practice, but luckily survived and got the Divine Shadow Leg.
Encountered an earthquake, was almost killed by a beam, and obtained the Nine-hundred Heavenly Dragon Steps.
The demons wreaked havoc in the capital, but they survived safely and obtained the magic weapon to subdue the demon pestle.
…
There are many dynasties, demons are rampant, and martial arts rule the world. This is a world without immortals and gods, and Taoism is hidden in the courts and mountains.
Three hundred years later.
When the Jing Dynasty was strong and prosperous, it ushered in its decline. The feudal lords came together and the emperor became a puppet in the hands of the powerful men. The dynasty was divided. After decades of conquest, the country’s power fell to the bottom. The surrounding foreign races took the opportunity to invade. The people were destitute and the world turned into hell.
The puppet emperor Jiang Xuanzhen came to the Taoist temple, knelt down and cried: “My descendants are unfilial and have no power to save themselves. Please ascend the throne and continue my prosperity for another three hundred years!”