The Mist Array, also known as the Miasma Array is one of the Array Formation Chen Fan used by using the Yin Crystal that he got from Yin Dragon Pond that makes a thick cloud of fog that envelopes the Yunwu Mountain Villa, which became an iconic landmark and becomes part of the Misty Mountain Array alongside the Spirit Channeling Array, the Spirit Gathering Array, the Guardian Array, and the Array Spirit, White Drakeling.
The fog itself is made out of Spirit Qi, and when mixed with the air, it becomes condensed to make Spirit Water, which later became the Yun Wu Spirit Water.