In Chapter 156, the remaining two li of the fire wicking bead

walked smoothly. Even the burning sun grass was picked on the road for more than ten years. This kind of grass has a great fire, and it is very effective for refining pills. Yanyangcao is one of the materials for making quenched pills and burning body powder. Yanyangcao with hundred years of medicinal properties is of some use. Even if it is insufficient for decades to make pills, even if it is filled with quantity, it will make a lot less than that with hundred years of medicinal properties.

it's not very useful for Wang Yu to pick...