Courage says that Samurai Jack can help us destroy the Crazy Brain Candy. Jack is in Forsaken Valley West. Go find him. He's a real hero!

Fuse is hiding the foul magical candy in a subterranean cavern deep inside his lair. It is impossible to access. But I believe I know of a way to destroy it.

Woo...Samurai Jack. I've heard he's the toughest guy on the planet. If anyone can help us destroy the Crazy Brain Candy, he can! Good luck, partner. -Edd

Collect a Great Shellworm shell

Proceed to the Precipice. You will be doing^[sic] deeper into the heart of his vile network, so stay on your guard. You must defeat the Great Shellworms to collect one of their shells.

Good work. Please bring the shell to me.

Deliver shell to Jack.

Return to me with the Great Shellworm's shell.

With the Great Shellworm's shell in our possession, our plan can proceed. But you must venture deeper into the Darklands, and it will be dangerous.

This shell will be able to transport the sap of an Eyebore, which is highly acidic. We can pour the Eyebore's sap into the earth to destroy the candy below.