Vast Sky Drizzle

When Jiang Ming woke up in a strange world, he learned he had obtained immortality. In the dangerous and ruthless world of cultivation, he was determined to carve his unique path. Taking advantage of his immortality, he vowed to learn forbidden skills that would normally eat away at the user’s life. 
As he continued on his path, Jiang Ming realized that with his forbidden skills, he could become the strongest. 

As An Immortal, I Only Learn Forbidden Skills

CatABoo

"By the way, how is the King of Medicine born?" Jiang Ming asked curiously.

"It's similar to the fire cloud grass. The herbs that fail to transform will fuse with the purple root grass to evolve into fire cloud grass, and those that succeed will be burned to death by the power of the sun. They will fuse with the fire cloud grass to evolve again and become the King of Medicine," Dr. Sun said. His tone was a little disappointed. "This kind of transformation is the wrong path. Even if the transformation is successful, there is no way to survive."

Jiang Ming looked at him in confusion. He did not understand why he was so affected by the fire mayfly's life and death.

"Alright, the spiritual energy in the valley has reached its peak today. I'm going to fight to the death here!"

Three Thousand Years and One Day (2)