Become invincible from the explosion of the alchemy furnace

Chen Xuan, the Immortal Alchemist, was killed by a bomb while refining his elixir. He was reborn in Fengyun Continent. He wanted to quietly refine his elixir and upgrade it, but he had to protect a fifteen-year-old girl. Kill the enemy? Chen Xuan threw out a powerful hallucinogen, and the battle scene suddenly turned into a chaotic dance of demons. Practice? Refining double the mysterious spirit pill at will, the level will be green all the way. What? You think I am so good at making alchemy? Didn't I tell you that in your previous life, you went to make elixirs after defeating all the invincible opponents in the world?