Senior Brother Is Simply Too Invincible

(From Investiture of the Gods to Primordial Chaos + invincible + cautious cultivation + lighthearted + mostly slice of life + no System + slow-paced) After transmigrating to the ancient age following the Witch-Demon War, Fang Heng spent a hundred years cultivating under his master at Carefree Peak. During that time, he cultivated diligently, displayed an extraordinary talent for cultivation, devoted himself to the Way of Formations, and developed his own poison arts. Before he knew it, his cultivation had surpassed his master's, and he had become a master of formations in his own right. But... he wanted no part of karmic entanglements, so he kept his abilities hidden and avoided conflict with the world. Over the past hundred years, he had dodged countless entanglements, both great and small. He thought he would go on living this way, until one day...