The Black Hand Taoist in Chapter 4 of "Black Myth Wukong" is a branch BOSS. There are two battles. After fighting, the hidden map in Chapter 4 can be unlocked. The following is a guide to the Black Hand Taoist side quest in "Black Myth Wukong". I hope it will be useful to you.
Pansi Cave - Broken Jade Pond, walk forward from the road next to Tutu Temple. (If you are afraid of centipedes, never look up!)
Listen to him first, then break the monster cocoon and fight the mafia man. When the Black Hand man lies on the ground and exposes the arms on his back, freeze and then break several arms on his back to get [Armplate] to attack him.
After passing the "Huanghuaguan-Guanmen" Earth Temple, walk up the long stairs and enter the courtyard. There is a treasure chest under the thick tree in the middle of the yard.
Go to the left side of the courtyard and go up the stairs.
When you come to the fork in the road, the left side leads to the "Jinguangyuan" Earth Temple and the final BOSS. Unlock the Earth Temple first, but don't go any further.
Then come back and go to the right first, there is a hidden level.
Go past the house on the right. There is a treasure chest in the house.
Go uphill all the way, and after walking up the last set of stairs, there are two paths on the left and right.
There is a downhill on the left. Go down the downhill and fight the Mafia man for the second time, and then you can enter the hidden level of Ziyun Mountain.
