What is the dark blue sphere for?

The dark blue sphere is used to open the treasure.

1, Yuan Qing Zhu Bao I * * * have 9, and friends need to kill black snakes to get them.

When friends collect 9 dark green pearls, they can open the treasure here in the nameless ruins.

3. After arriving at the location of the treasure chest, the friends need to consume 9 dark green pearls to open the secret room.

4. After entering the secret room, there will be three treasure boxes, gorgeous treasure boxes, precious treasure boxes and exquisite treasure boxes.