The Origin Source Flame was the ultimate source of flame.
Flame represented succession, life and civilization. On the other hand, it could also signify destruction.
Refining elixir pills with the Origin Source Flame was a perfect display of life.
The flame wouldn't destroy the spiritual grass violently. Instead, it would fuse it perfectly into a new form.
It was just like the sun that emitted flames. Only sunlight could enable better growth of many other living things.
As the Origin Source Flame melted the spiritual grass and enveloped it perfectly, it was able to prevent the loss of the medical effects.
This process had also skipped the most important step of controlling the temperature of the flame.
At the thought of Wang Xian, the liquid of Qi Accumulation Grass and Water Flower fused together into a sphere slowly.