Lifespan Gu

Year-count forms differ. One three hundred years lifespan Gu is like a blue snake coiled into a round loop, and one five hundred years lifespan Gu is like a young dragon bearing its claws. ^{ch. 390} Another three hundred years lifespan Gu looks like rough-textured roots coiled into a circle. ^{ch. 402}

Lifespan Gu are hard to find, their locations are fixed, and only heaven and earth create them in limited supply. After surveying other extension methods, Spectral Soul’s critique still treats lifespan Gu as the best choice. Venerables exhaust natural stocks and then invent substitutes. ^{ch. 599}

They are only mortal Gu. Their production conditions vary widely, Gu Immortals often find them only by luck, and mortal Gu Masters often obtain them first. ^{ch. 778} Musing over Giant Sun’s true inheritance, Spectral Soul Demon Venerable reflects that heaven’s will is vicious and governs lifespan Gu’s output, so fewer and fewer are being produced. ^{ch. 1015}

Though only mortal Gu, lifespan Gu are among the strongest forms of currency in Gu Immortal transactions, and almost nothing compares to them. ^{ch. 1074} In many high end transactions Gu Immortals will not take immortal essence stones and want only lifespan Gu, which makes lifespan Gu a hard currency. ^{ch. 1128} Time path methods that add lifespan with day Gu, month Gu and year Gu carve time path dao marks into the body, and once those accumulate the person can no longer use lifespan Gu. ^{ch. 1400} The Gu Immortal world ranks the development of an immortal aperture in seven ordered levels, and the seventh is producing lifespan Gu. ^{ch. 1489}

Lifespan Gu is a heaven path Gu worm that people cannot refine. Even in a venerable’s era, natural production of lifespan Gu falls while the venerable lives. ^{ch. 2085} A Gu cultivator’s lifespan is in fact heaven path dao marks. ^{ch. 2275}