Lasting Gu is used with continuing Gu so a lower-rank Gu Master can feed primeval essence into spring egg Gu over a long planting attempt.
Man Duo tells Shi Wu that spring egg Gu is a rank five Gu with extremely high demand on primeval essence, and that even a rank five middle stage Gu Master cannot activate it at one try. Elder Shi Wu has rank three cultivation, so he would need to use lasting Gu and continuing Gu to activate it, and that way the quickest planting of the spirit spring would take close to a month. ch. 554
Planting attempt
Shi Wu brings the spring egg Gu with Man Duo, prepares, then sends his primeval essence into lasting Gu and continuing Gu before injecting it into the spring egg Gu. ch. 555
Chronicle
Connections(4)
0 later connections are veiled.