When you enter the desert and go up to the quicksand pool, a big centipede appears. You can destroy it by attacking the centipede's head for 8 times. Be careful not to walk in the middle of quicksand or you will suck it down. After destroying the big centipede, you will get the key of the lamp fish monster.

Back to the animal village, the owl appeared and told us to go to the waterfall in the mountain. Don't forget to step on the transmission point in the pool below the animal village and record it.