Longevity: Starting from Tiangang

[Strategy and cool writing + later invincibility + personal imagination + fictional history + ascending the throne and proclaiming himself emperor] In the first year of Zhenguan in the Tang Dynasty, the national teacher Yuan Tiangang and the general Li Chunfeng prepared a prescription for immortality and presented it to Taizong. Taizong did not dare to take the medicine because of the serious side effects, so he did not take the medicine for immortality... Although Taizong did not take the medicine, in order to protect the Tang Dynasty forever, he secretly ordered Li Chunfeng to prepare another elixir and fed it to his eighth son, Li Qiandao. Unexpectedly, God failed to fulfill his wish, and Li Qiandao fell into a coma after taking the elixir. For this reason, Taizong ordered Li Chunfeng to secretly send him to Mobei to find Duokuo and Huo Xunsheng. As a deal, Taizong promised to preserve the bloodline of the Mobei clan with Li Qiandao's orders. In order to protect the peace of Mobei, Duo Kuohuo used ancient methods to summon a ghost of the dead to reside in Li Qiandao's body... After rescuing Li Qiandao, Li Chunfeng divined a hexagram for him. The hexagram represented a hidden dragon that should not be used. If given the opportunity, the dragon would surely be able to fight in the wild and recreate the prosperous age of the Tang Dynasty! Waiting for the opportunity, he hid it in the mountains and took good care of it until one morning a hundred years later, a different Li Qiandao woke up...