There are streams of water here, so watch out for them. If you sly into them, they will drag you down, to the ground level. After you fly left, you will find a place with broken tracks. There are many collectibles there, but also many opponents. Do not let them surprise you. Usually, they fight alongside opponents that speed up their turns.
To leave this place, you have to fly into a cave with blades of a mill in it. Do not touch them. The spikes will deal damage to you. Slowly, fly up, where you find a lever controlling the other entrance. Fly down now, on the left. As soon as you cross the passage, you will encounter Norah, who will join your party. She starts with 10 skill points.
From the spot where you have met Norah, fly left. Push over the wooden block to the stream on the left. It should land exactly where it opens a new passage. Fly to the very bottom, where you find the passage on the left. Again, you have to watch out for the sharp edges of the mill blades. Fly up and move the lever, which will open the door on the other side. You can now cross it.
There are new opponents there. The one resembling a tree can deal damage to all of your characters at once and therefore, you have to deal with him in the first place. If you fight as Rubella, cast shield for both of your characters at the beginning of the fight.
Up ahead, on the left, there is a passage. You have to fly up and avoid the spikes. Move the lever on the left to open the door and set correctly the one on the right, so that the trap is oriented horizontally (the above screenshot).
After you cross the door, go left. You will meet Lone Capilli, who will give you several oculi. From this spot, fly up. On your way, you will spot a rock resembling a man's face. After you reach the top of the rock, this chapter will end.