Slug

Slugs inhabit many forests in Erethborn, and they look a lot like Earth slugs.

Appearance
They have a glutinous body that undulates when they move. Their eyes are on stalks.

Significance in The Red Wizard
When Eronor and Sordin are spying on the goblins, a slug crawls into Sordin's mouth. He screams and spits it out, revealing their position. The goblins notice and chase them.

Trivia
The slug may be a reference to "Avatar", where Brandon follows a purple snail and is carried away by a harpy.