I Have a Sealing Pen

I have been trapped in the deep valley for who knows how long. Zheng Shangqing picked up a copper brush from the skull's belly. The characters on the bloody copper pen immediately lit up red one by one... The soft breath he let out immediately turned into a huge white cloud when it touched the copper pen, carrying him soaring away, leaving this desperate cliff and deep valley... But what he stepped into was a world filled with chaos and demons...