[One minute later, you arrive at the center of the lake where there is a huge hidden reef beneath the water's surface.]
[Two minutes later, you reach the eastern side of the hidden reef, and a deep cave appears before you. You enter the cave.]
[The cave extends straight ahead, and after a few breaths, you suddenly awaken from the illusion, finding yourself in a huge arch-shaped space, like a turtle shell.]
[You don't know what happened, but you quickly realize that you might have been trapped in an illusion, yet you can't tell if it was the previous one or the current one.]
[You carefully observe your surroundings, which are empty except for a large number of broken stones.]
[As you search among the debris, six stones of a different shape catch your attention - they are six oval stones.]
[The stones are grayish-green in color, and unlike the other stones, they are unusually regular, resembling eggs laid by some creature.]