However, the potent poison within these Three Emperors' Poison Cauldrons had only accumulated over a mere two to three thousand years at most. According to the records in Three Emperors' Poison Canon, the most they could achieve was transforming a cultivator's body, during the middle phase of Foundation Establishment, into a toxic one.
However, Xiao Qiang didn't want that much. Having a toxic body might make him invincible during the Foundation Establishment phase, but it would also take away many pleasures. Especially given that he now possessed such an ultimate Daoist technique as the Tao Te Ching, there wasn't any necessity for him to cultivate the Three Emperors' Poison Canon.