Teredo

Teredo is the guardian being of Downland.

Appearance
It is a giant yellow-brown, worm-like creature that resembles stone. It is segmented and has feelers on the top of its head. It's body has several dark spots and its head has a bolt-like pattern. It's mouth is dark brown with lines across the triangular shaped opening and red fangs in the center.

Season 2
In "Runaway Groom," the guards summon Teredo to stop Bloom, Stella, Aisha, and Sky from reaching the Royal Palace.

Trivia

 * It is called the Guard Worm in the 4Kids version.