The so-called external elixir was something that was refined from the Golden elixir of others.
The demonic core of a fourth-order demonic beast was the worst choice, while the Golden core of other golden core cultivators was better.
But no matter which one it was, they were all extremely rare.
Each golden core represented the death of a Big Shot of the same level. How few golden core cultivators were there? For example, the Feiyun state was a small piece of land, and the death of anyone would be a major event that would shake the entire state.