Ning's plan was simple. He wanted to gather up some resources to build the interior of the secret realm, some treasures to lure them in, and then some reputation to make it worth it.
He could have the first of the 2 easily, but the 3rd one was hard. So, he had decided to go about it in his own way. Along the way, he could also fulfill the first and second plan without having to use system.
The many spirit stones Ning had gotten from the Prawn family were used up to buy many different types of treasures for his secret realm.
There were a few that tried to rob him, but he robbed them instead and used that money to buy some treasures too.
Then, with almost no spirit stones with him, he walked back out of the city and near the gate planeted a post with something written on it in big, bold letters.
'Anyone who can defeat me in a battle will get whatever skill or treasure they want.'