Desolate and frostbitten, this glacier is far from lifeless. The heat-seeking Snow Wraith attacks trespassers like an avalanche to defend itself and its mysterious connection to the Dragon’s Eye. Led far away from Berk and far out of their comfort zone by clues hidden within the Dragon Eye, Hiccup, Toothless, and their teammates ventured to Glacier Island in search of the elusive, arctic dragon. However, the Dragon Riders were not the first Vikings to venture to this icy and extreme environment. Village elder Gothi was once part of an expedition into these frozen hinterlands years ago in search for pure glacier water, and barely survived the experience. The Snow Wraith is to winter what the Night Fury is to night. It senses the fall of each snowflake. It hears the glacial movement of every iceberg. It feels the slightest change in even the most frigid of temperatures. The Snow Wraith is the sole and uncontested denizen of its island. And when the chill wind roars, it might be the weather, or it might be the Snow Wraith descending upon its next victims.
As told in "Dragon Eye of the Beholder, Part 2", many years ago, Gothi and two other Vikings ventured to island seeking glacier water for healing purposes. However, they were ambushed by Gothi's Frostfright, a Snow Wraith. Only Gothi survived.
Three years after the Berserker War, Gothi then joined Hiccup and his riders in finding the Snow Wraith in order to get a tooth from it to unlock the Dragon Eye. They were successful as Gothi was able to get a tooth from the Snow Wraith that got lodged on her staff.
Later in "Snow Way Out", Heather, Ryker Grimborn, and his Dragon Hunters then went to the island to capture the Snow Wraith. However, they were stopped when Hiccup and his riders took the Snow Wraith pack to another island.
- Glacier Island is very far north. According to Hiccup's Map, it is located nearby Dragon Mountain, which is also located in the far north.