What Does It Mean That the Strongest Monk Is in the Qi Training Period?

Is the ninth level of Qi training the strongest? This world of immortality is too weak. After the mediocre Xia Wutian was killed by a monster, he went to a thousand years later, where foundations were built everywhere. Uh, it doesn't seem to be that strong? And he is the one-of-a-kind Heavenly Spiritual Root. Before he could be happy, the whole city was reduced to ashes. He's back. Take the future with you and subvert this era.