Since he left Black Armor Battlefortress for over 1 month, Zhang Tie improved his overall strength at the fastest speed. During the past 1 month; especially in the demon base, Zhang Tie killed hundreds of spider demons and hundreds of common ox-headed demons which brought him two fruits of source. After taking the two fruits of source, Zhang Tie was able to constantly knock over some earth demon knights face to face in the large-scale battle between humans and demons 10 days ago in his foundation consolidation period as an earth knight.