This stone is called Purple Cloud Mother Stone, which is a rare fifth level top defense type Holy material.
It can resist most five element spells at the fifth and sixth levels. It is often used as the core spiritual material of the fifth level defensive magic weapon, and even sometimes appears in the list of refining spiritual materials of the sixth level virtual smelting magic weapon. It is not the core material, but used as an auxiliary spiritual material.
However, it can also be seen from these information that the effect of this amethyste is powerful.
Wu Xian had to bargain with this gold elixir who also recognized the treasure. Finally, she changed the price from nine five level top spirit stones to seven five level top spirit stones and bought them