As he was trapped within the standalone space due to the Star Demons, he naturally needed to find a way to leave.
However, Jian Wushuang was dissatisfied with relying on himself to accumulate Divine Power by training for many years. Hence, he had to hunt down the Star Demons and get their Demon Cores.
However, there were too many Star Demons and they were extremely powerful. Thus, it would not work if he were to use normal hunting techniques.
Therefore, Jian Wushuang drafted a plan to hunt them.
Frankly speaking, the plan was very simple.
He would use the First Move, Split the Heavens Seal, of the Mountain River Map's Nine-province Seal and do his best to kill the Star Demons.