Chapter 318: Great Harvest

First,

the Ice Crystal Coffin worn by the black-robed elder was used to isolate his aura.

Jade Soul Algae are extremely sensitive to the aura of cultivators; they would immediately hide themselves upon detecting even the slightest trace of a cultivator's presence.

Moreover, the Jade Soul Algae moved incredibly fast, and their concealment abilities were outstanding; once they had hidden themselves, they became all the more difficult to find.

Therefore,

before attempting to capture the Jade Soul Algae, one must take care not to let them detect even a hint of one's aura.

After capturing one, inevitably, one's aura would be exposed, and once exposed, it would disturb the other Jade Soul Algae. Sensing the aura, the others would also immediately go into hiding.

And, Jade Soul Algae were also very timid.

After going into hiding, they would need to wait at least three days before daring to appear again.