Wenren Xin's alchemy skills were average, and she only knew how to refine one type of Foundation Establishment stage elixir. However, it just so happened to be related to puppets. It was called the "Omniscient Spirit Transforming Elixir," which was used to help the puppet master cultivate great divine power.
The great divine power was called "Omniscient Spirit Transformation!"
Its effect was to temporarily transform a spiritual item that was compatible with one's spiritual root into a battle puppet after expending a large amount of inner energy!
On the other hand, Fang Qin's elixir was more brilliant. It wasn't a Core Formation stage elixir, but it was even more difficult to refine—the Six Alloy Elixir!
As for why he refined the elixir, it was naturally Fang Qin's doing.
After all, Fang Jinyu's reward for the top ten was the Six Alloy Elixir.