Pill veil

Although the majority of medicinal pills were supposed to be consumed immediately or within a certain amount of time, some weren't. They were to be stored over long periods of time.
These pills were covered in a special layer called a pill veil that allowed them to absorb energy from the sun and the moon to nourish the pill. This nourishing effect was very slow.
The method to refine such pills had already been lost. Thus, such pills were normally only found when exploring ancient ruins.
But not all pills could be stored for so long. Some pills would eventually become toxic, and as soon as you consumed them, you could ascend.
==References==
Category:Alchemy
Category:Pill
Category:Missing Chinese Name