Sex Change, There Is a Demon in the Ring Who Wants to Take Away the Body

[Marriage change + strong woman + fantasy + non-traditional immortality + no system + becoming stronger and growing + royal blood] Traveling through the world of cultivating immortals for eighteen years, I almost got stabbed in order to get a ring. I thought the ring would be an old man, but it turned out to be a villain. This demon king pretends to be super cool and stingy, but fortunately, he is serious about it! What to do if there are bottlenecks in cultivation or injuries? Demon Lord teaches and gives pills! What to do if the opponent is too advanced to defeat him? He has heaven-level magical powers and is possessed by ghosts! Did you think you were going to become Feng Aotian all the way? Wrong, this Demon Lord has done all this and actually regards me as a furnace and wants to take my life away from me?