Silver lightning tree

Deep underground in Forest Lightning grotto-heaven, a vast lightning forest flashes and thunders without pause. The flashes of lightning form a tall silver tree that lasts only a moment, with large thunder leaves and many silver lightning branches that materialize and tempt the watching immortals. The two heavens alliance’s Gu Immortals call these priceless lightning path rank eight immortal materials. ^{ch. 2020}

Those surface forms are only the superficial wealth of the lightning forest. Records in The Legends of Ren Zu say the source of a lightning forest is lightning Gu, and the scale of this forest is enough to prove a rank eight lightning Gu is present. ^{ch. 2020}