As long as any living thing enters the range of the Yin Yang Rebirth Array, it would be blown by the evil wind, and its flesh and bones would dissolve, which is extremely terrifying.
The existence of these Array Skills.
If it were someone else, they would probably need to invite several cultivators proficient in array tao to set up the formation.
Not to mention how many spirit stones those proficient in array tao would demand to be mobilized.
Just the Array Skills laid out by He Song, within the realm of the Golden Elixir Array, are not considered common goods.
Not all cultivators proficient in array tao are capable of successfully setting them up.
The Yin Yang Rebirth Array.
The Divine Thunder Array.
The Gathering Yin Array.
A complete Spirit-Gathering Array.
It's not rare for cultivators in the Cultivation World to be able to set up just one of these arrays.
But to set up all of these arrays, one would probably need to invite several cultivators proficient in array tao.