[freddyfox]

Get the fishing pole at Babord in the fishing shop. Go to the southern docks, and throw your line where the splash in the water is. You'll snag the conch shell.

Go to the gnomes house, defeat the baddies, yada, fall down the hole in the right room. Now, after you've fallen, go to the left. You'll get to a big glass case with a giant rock above it. Use the conch shell here, and the rock will smash the case. You can pick up the mirror shield then.