| || That's not the Archer of Azzure!
The term "Shuttering Shield" has not been confirmed by official sources and is merely conjecture.
The Shuttering Shield or Shutting Spell is a spell the Shadow Lord placed across the Barrier Mountains, which borders the monster-filled Dead Plain. Anyone can enter through the Shuttering Shield into the Shadowlands, but once in the Shadowlands, no one can pass through the shield back to Deltora. The Shadow Lord can sense when anyone crosses the Shuttering Shield and enters its domain.