The Great Ice Cliff is an animus touched wall that shoots large icicle spears at any dragon who is not an IceWing if they attempt to fly over the wall into the Ice Kingdom. It was an animus gift from an unknown and unnamed IceWing animus, and was named the Gift of Defense. It was mentioned by Winter in Winter Turning when he and Hailstorm flew over it. The only way for a dragon that's from another tribe to fly over without getting killed is to put on one of three animus-touched bracelets that prevent the Great Ice Cliff's effects, they were called the Gift of Diplomacy. The reason the IceWings only have three bracelets may be because it would prevent large groups of dragons from other tribes from entering the Ice Kingdom.