Upon entering the template in the To the Night, What is the Night's World Quest, you'll need to find a way to go deeper into the ruins. To do this, you'll solve three lantern puzzles to unlock a mechanism to lower the water level. Here's how to find and solve them.

The puzzles below can be solved in any order.

Once you get the mission objective, transform into a Yumkasauri using one of the symbols in the ruins, then move to the small corner with the arrow pointing above, to the left of the locked mechanism (the area is on the right side of the map, as shown in the image below).

Once you're at the indicated location, use the Yumkasauri's elemental ability to pick up a red crystal, as pictured above.