The Ten Thousand Spirits Demon Monarch, although called a demon monarch, is described as such based on his conduct. His skill's origin is actually both righteous and evil, and this veteran Daoist Monarch even practices simultaneous cultivation of the Dao and the Demonic Way.
This low-profile veteran Daoist Monarch, it's unknown when he forged two divine bodies of the Taoist Monarch: the Taoist Body and the Demon Body, each incredibly formidable.
Regarding Pei Xuanjing's actions of reforging the Gods Sealing List, this veteran Daoist Monarch did not interfere at all because he understood that his own cultivation path is both righteous and evil, leaning more towards the Demonic Way. Without any conflict of interest, the Daoist Monarchs of the Taoist School wouldn't bother him, but interfering in this matter would inevitably provoke opposition from strong figures of the Taoist School.
