Transform into a Fairy and Strengthen the Offspring System to Make Me Invincible

(This is not a mindless novel, I want to write a realistic romantic story, anti-filial piety (emphasis added), anti-routine, slow pace, but everything that should be included) Wang Xiaowu has been single for thirty-five years and has never even held a girl's hand. He is a golden bachelor~ Once I traveled through time and became a little fairy, I looked over and over again and was very satisfied with myself, but I had no way to become an immortal. Fortunately, I picked up the Enhanced Descendants System. (There are emotional lines, hundreds of changes, a slow start, and the content in the introduction will gradually appear later.) You can use krypton spirit stones, choose a host to turn things around, and let the host give birth to heirs. The more krypton you earn, the stronger your offspring's qualifications will be! 10,000 Low-grade spiritual stones, high-grade spiritual roots! 100,000 Low-grade spiritual stones, super-grade spiritual roots! 10 Million low-grade spiritual stones, top-grade spiritual roots! ....... Spend 1 billion high-grade spiritual stones and randomly select mutant rare spiritual roots! Why is my big guarantee crooked? Why did it come out as ordinary spiritual roots? It doesn't matter if I can't become an immortal, as long as I strengthen enough descendants, I will eventually become invincible.