The Great Ice Cliff was an animus-touched wall that bordered part of the Ice Kingdom. The cliff shot icicle spears at any dragon who was not an IceWing if they attempted to fly over the wall into the Ice Kingdom. It was an animus gift from an unnamed IceWing animus and was named the gift of defense. The only way for a dragon 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, known as the gift of diplomacy. In The Dangerous Gift, the Great Ice Cliff was destroyed by Snowfall, who used the gift of strength to smash it.
The Jade Mountain Prophecy
The Lost Continent Prophecy
Queen Snowfall asked Jerboa III to extend the Great Ice Cliff to protect them from the LeafWings and SilkWings, but not only did she not want to, but Jerboa was also unable to complete her request due to animus magic currently being broken.
Queen Snowfall realizes that isolation is the root of a number of problems that the IceWings face, so she uses the gift of strength to destroy a section of the Great Ice Cliff. She mentions that she plans to return with a larger group later and destroy the remaining sections.
The NightWing diplomats are given the gift of diplomacy to fly over the Great Ice Cliff. It was seen at the end of the short story when Foeslayer, Prudence, Starclaws, Discretion, and Arctic were leaving the Ice Kingdom.