Item
Ink Crystal
Description
The Ink Crystal is extremely hard, so much so that not even an Immortal artifact could destroy it with a direct attack. Furthermore, it possesses a peculiar type of elemental energy within it, which is extremely corrosive, making it an exceptional material for refining Yin-type Immortal Artifacts. If you were to add some Ink Crystals into an ordinary Yin-type Immortal Artifact, not only would they be able to corrode the weapon, but their durability would also be greatly enhanced as well. If you were to trade them with some cultivators who practice Yin-type cultivation techniques, they would definitely be willing to spend their entire fortune to get their hands on that treasure.