Yume 2kki - Lesser Guardians Hine, Uwa, Hesu [Read Desc]

From 2:34 to 3:26, while the Rainbow Maze itself is not very flashy, I use the Rainbow effect's flashing very frequently. This might present problems for people with epilepsy or photosensitivity issues.
In order to access the Rainbow Maze in Shadowy Caves, you need to have visited Stone World at least once. This is not demonstrated but still important.
Our last stop is the Abyss of Farewells. You need to unlock this area in the Rainbow Maze first, which is demonstrated here.
Hine is the "wild" one, the very big one inside one of the double door rooms.
Uwa is the "shrined" one, inside the cave on the third floor. Post-interaction, you can find them swimming in the waters where the dots appear.
Hesu is the "sealed" one on each floor, whose true form is a large sea serpent. Note that you need to interact with their sealed form to progress to the next floor.
The peeping stone reads, "Water seeks its own level".