From the introduction:
Welcome to the world of Battle Through The Heavens. This is a Xianxia world filled with cultivators, magical beasts, and mystical plants. In this world being receptariers, or alchemists, is an extremely important profession due to the rarity of pills. As such, even the most basic receptarier is considered much more valuable than any other cultivator of equal level. All receptariers, as well as most cultivators, wish to obtain something unique to this world: a Heavenly Flame, a king of flames formed by various extreme conditions. You will be inserted into this world just before Na Lan travels to the Xiao clan to break off her engagement with Xiao Yan and starts a snowball of events. There are various organisations at work in the background, so try not to stand out too much unless you are sure of your safety.