Earth shell snails lived in the depths of Earth Trench, or rather, they could only live there.
According to what Fang Yuan said, to collect the star night mucus, he would need to enter deep into Earth Trench and find an earth shell snail, trailing behind it as the snail moves, processing the mucus on the spot.
After processing it, he had to collect the star night mucus in a very short amount of time.
There was great difficulty in this, and it was very dangerous.
Earth shell snails had mild temperaments, it was not hard to get near them, one could even stand on their backs and attack them lightly, this desolate beast would not get angry.
The danger came from the fact that Earth Trench did not only contain earth shell snails.
The deeper one went into Earth Trench, the more fierce beasts, mysterious plants and wild Gu worms would show up.