Starting from the two realms, cultivating immortality by taming beasts

Five Great Grotto-Heavens, Thirteen Immortal Sects, Seventy-Nine Upper Sects, and Ninety-Nine Orthodox Sects. In this era where the Immortal Alliance rules the world, cultivators must use the method of borrowing beasts to cultivate and obtain the Dao Fruit, thus attaining immortality.
However, cultivating immortality by borrowing beasts requires a lot of resources, and the poor cannot climb the ranks of immortals; without money, one cannot cultivate immortality at all.
Chen Beiwu came from a declining family with limited resources, and his future cultivation path was predictable; at most, he could achieve the Foundation Establishment stage, but he would never reach the Golden Core stage.
Until he stumbled upon a priceless treasure, opening up an unknown path to immortality.