Shang already knew what he would focus on next.
After entering the Isolation Barrier, Shang summoned several extremely powerful Peak Abomination Lords.
Abomination Lords were incredibly powerful, and they could even win against Clouds in a duel, but Shang was on a completely different level, which was why he needed several.
Shang had already realized that he could even summon Abomination Kings, but he hadn't summoned one yet.
Summoning an Abomination King could theoretically put the entire world in danger in a way that Shang didn't want.
What if summoning an Abomination King opened the world to being invaded by more Abomination Kings?
The Lightning Emperor had told Shang that Abomination Kings had been the most powerful Abominations that humans had ever seen and that they had been quite rare, even back when Lucius had been a Mage Emperor.