The Eldest Senior Brother Seems Weak, Yet He's the Strongest

There was a legend at Wujian Sect. They said the sect's senior disciple had mediocre cultivation and a frail constitution, the sort of person who would cough up blood after taking a single step. They said Wujian Sect's senior disciple wouldn't live to see twenty. They said... There were too many legends. Until one day, when demons attacked, the senior disciple of Wujian Sect drew his sword. One stroke split heaven and earth and swept across ten thousand miles. Only then did everyone realize: The senior disciple of Wujian Sect was the strongest of them all. Theme: Never underestimate anyone. We're all stocks with potential.