How does Walter Scott use imagery in Wandering Willie's Tale?

The story employs many of the techniques of Gothic fiction: supernatural elements including ghosts and demons, wine that turns to blood, and cold water that suddenly boils; Gothic settings such as an old castle and a journey through a dark wood; a mysterious stranger; and moments of terror. However, unlike the traditional Gothic story, the purpose here is not to create terror for its own sake, or to show characters succumbing to supernatural forces, but to show how the protagonist succeeds despite being in a frightening situation.