How to unseal the demon sword of Warcraft rpg 2 Baguio 2.6?

No matter what the weather is, the sword is still unsealed. It's okay. Come out and brush and wait. When there is white fog, it is usually once. Sometimes not. And it will only appear after you kill the fairy. Only when this white fog appears (usually it just fogs) can you pick up a stone and unseal it after entering Gengetsu's abode of fairies and immortals.

Finally, I advised Zhu Xian to play as early as possible. = = Because of the mythical difficulty of playing white fog, I played it a little late several times until I finally played the ghost king. It's almost over. We can fight early and abort early. Hoping to be adopted alone.