Evil Cultivators would never come to deliver themselves to their deaths.
So, in a sense, the dozens of Foundation Establishment and thousands of Qi Cultivation cultivators now under Su Ping's command are already the essence of what remains in the Southern Desolate.
As for mortals?
Unless they had migrated away from the Southern Desolate early on, the mortals of the Southern Desolate had long been extinct.
With the strange changes in the Southern Desolate, the pathways connecting to the Central Domain had become increasingly dangerous and terrifying.
Fortunately, Su Ping excelled at overcoming cunning with brute force.
When faced with mists blocking the path, he would simply summon the Body of the Blood God and trample the mists flat.
If malevolent spirits and monsters attacked, it was even simpler; he would continue to summon the Blood Sea to wash all these creatures into the Blood God Secret Realm as snacks for the Blood God.