I Actually Ascended After Dual Cultivating with the Immortal Venerable

A cold and aloof Sword Immortal senior sister takes in a pitiful little junior brother. She plans to raise him casually, but before long, the little waif becomes a possessive Immortal Venerable and insists on resonating their spiritual roots. Worldbuilding: This world blends Eastern cultivation with a romance between an older woman and a younger man, creating a cultivation realm ruled by strict hierarchies yet rife with hidden currents. The cultivation system has nine major realms: Qi Refining, Foundation Establishment, Golden Core, Nascent Soul, Deification, Void Refining, Body Integration, Great Ascension, and Tribulation Transcendence. Each realm is further divided into early, middle, and late stages.

Unique setting: The cultivation realm has a rare phenomenon known as "spiritual root resonance." When two cultivators with highly compatible spiritual roots cultivate together, their cultivation speed can increase geometrically. But this also means that once they become Dao companions, if one dies, the other's cultivation will suffer a serious setback.