Besides helping Alice's mom, there were two things on Zion's mind: finding Lidia and Alice, as well as getting stronger.
His battle against the demonic human Carl left him feeling weak, like his battle against Olzak. Sure, he could actually stand a chance against Carl and even managed to brutally harm him, but he was still far too weak to get past him and help Lidia.
He didn't want to rely only on his tech and the people working under him, he wanted to be out there himself searching for his loved ones. But to do that, he needed to be stronger, way stronger than he was currently. His mana method wasn't enough, his runic body wasn't enough, his magic and aura weren't enough, and it was time to break through to the master stage.
