No need to accept tasks. As long as there are incomplete Guigu runes, the formation can be opened directly.
You have to go to Dongshan Island to break the formation first. Then you can teleport to Yunmeng Valley. Sacrifice platform. The godswood. . .
There are eight major formations on Dongshan Island, which are Qingfeng - Broken Water - Qianyue - Yirou - Reaching for Stars - Nurturing Spirits - Zhuliu - Qianqiu (pay attention to the order when breaking the formation. This sequence is the so-called Guigu Bafang Chain Array)
First, fight twenty-six incomplete Guigu runes (two are needed for each array on the monsters in each array)
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The other ten will change to a Guigu rune in Qiuxian Town
When breaking the formation, remember that the order of the eight formations must not be wrong. It is best to complete the line change in the middle in one go, which may not succeed. After the eight formations are broken, you can enter the new map Yunmeng Mountain by finding one of them