Definition
**The Economics of Immortality (修仙经济学):** The introduction of the Spirit Stone system is where your standard Western fantasy and Xianxia diverge sharply. In many Western systems, gold is the universal currency. In Xianxia, that's for mortals. The real economy runs on refined, condensed spiritual energy—the Spirit Stone. This isn't just a plot convenience; it’s a brilliant reflection of the world’s core logic. The ultimate resource is the energy needed to live longer and gain power. By making that energy a physical, depletable, and hierarchical currency (Low-Grade to Supreme), the novel introduces a built-in engine for scarcity, class division, and conflict.