Minghe did not know how the world was in the Chaos, which might be full of all kinds of danger. Luck was essential for people who wanted to be stronger. Though Minghe's Luck was strong, it was insufficient. He would strengthen his Luck continuously whenever he got the chance to. Only when his Luck was stronger could he go further.
As for the Demon Tower, it was good but meant nothing to Minghe. The Way of Demons had now been established, and it would not dissipate just because of the death of Wu Tian. The Demon Tower was just waiting for someone who had the affinity. Thinking of that, Minghe casually made a crack in the air and threw the Demon Tower into it. No one knew where the Demon Tower would go to.