How do you get Merlin on Astro Knights Island?

The robot owl Merlin is in Mordred's underground lab (under the hay bales in the field). He will fly out when you open it. Feed him the robot mouse and he will follow you.

To get the key :

1. Get the secret message from the maid's room in the castle
2. Go to the mill and talk with the girl up in the hay loft. Get the Cosmic Symbols card.
3. Go to the plaque on the village fountain and press the three symbols, and the sun.
4. Get the key from the secret society.

To get the mouse, find the moldy cheese in the dungeon and feed it to the mouse in the maid's bedroom in the castle (first floor left). When you open the lab under the hay bales, and feed the owl, it will follow you around, in the mill area and into space.