He transmigrated into the Primordial World at the dawn of creation and became Tongtian, one of the Three Pure Ones!
Would things still go as they had before, with him becoming the youngest of the Three Pure Ones and being jointly suppressed by Laozi and Yuanshi?
Not a chance!
He would turn the tables and become the elder brother of Laozi and Yuanshi, lording it over them with every right to do so!
So Tongtian first snatched Laozi's Heaven and Earth, Black and Yellow Exquisite Pagoda, then left Laozi and Yuanshi behind, went to Mount Buzhou, became the big brother of the Twelve Ancestral Witches, and led them back to Mount Kunlun.
Laozi and Yuanshi couldn't even be second and third brothers, let alone the twelfth and thirteenth!
This novel and its characters are entirely fictional. Any similarities are purely coincidental. Do not imitate.