C174 It is imperative to save people

Time silently flowed by, Lu Fan's entire heart was immersed in the process of refining pills.

Rank four Yuan Dan was indeed very difficult to refine. Up until now, Lu Fan had already failed seven or eight times, wasting quite a bit of medicinal ingredients.

Fortunately, in the vast Vault of Medicine, Zhang Xuan didn't mind such small amounts of medicinal herbs.

Basically