There are many elements which work to help Mark figure out what needs to be accomplished to defeat his foes. One such element was the introduction of the dream catcher which eventually leads Mark to a spirit guide that gives valuable advice. The dream catcher is an important element in many ways though. These devices were originally created by Native American tribes who wished to protect tribal members from nightmares that flowed through the night time air. When you look at the dream catcher you have to understand that every aspect of the dream catcher is important. One of the most iconic elements in the webbing, which is much like the spider webbing that protects Mark. The webbing helps trap the negative while filtering the positive dreams down to the dreamer via the dangling feather. Mark was very lucky with his dreaming abilities, no matter the nature of the dream, as he utilized all elements of the dream to his greater advantage. However, the dream catcher was his way of unlocking valuable information and strength for his upcoming battle.

To learn more about dream catchers and their many meanings try out this page:

http://en.wikipedia.org/wiki/Dreamcatcher

If you're interested in making your own Dreamcatcher this might be helpful:

http://www.wikihow.com/Make-a-Dreamcatcher