Regret water rock

Constructing coiling thread caves requires a Gu formation, rank six immortal material dark soft silk, and rank seven immortal material regret water rocks. Fang Yuan names both materials among what he must gather once he has funds for a large expansion of that resource. ^{ch. 1316}

By Dong Fang tribe’s method, coiling thread caves need a Gu formation plus dark soft silk and regret water rock so ordinary spiders can transform into regretful spiders. Fang Yuan gathers dark soft silk and regret water rocks, paying a large amount of immortal essence stones and other immortal materials for them, before he attempts the Gu formation itself. ^{ch. 1327}

Working from the same coiling thread cave formation, the one that needs dark soft silk and regret water rock together, ^{ch. 1327} Fang Yuan has Chi Shang attempt a modification meant to multiply the regretful spider yield eightfold, but the deduction proves unsolvable and the plan is abandoned. ^{ch. 1330}

Regret water rock is named among a large stock of earth path immortal materials packed into an immortal aperture when preparing for tribulation. ^{ch. 2133}