Immortal Showing the Way Gu

At a feast, Fang Yuan asks Wei Yang to advise him, and Wei Yang teaches that a rank three Gu Master has to choose a direction and build a set of Gu worms along it. Someone who likes to plot, he says, can collect thinking-assist type Gu worms, like the lightning thoughts Gu or the immortal showing the way Gu. ^{ch. 275}

No other chapter names it. The text states no rank, path, form, or effect for it. ^{ch. 275}