A couple of people here have noted that Hunts-The-Ice (hereafter, Hunts) was a sympathetic character, despite being of chaotic evil alignment.
If Hunts has any alignment, it would simply be "Hungry", except he's intelligent. It would probably be closer to "Neutral"; He doesn't overhunt, stays away from the natives, and maintains a balance with the environment.
Hunts' sire and dam escaped the ruin of one of the last of the northern battles in what is called The Dragonfall War, which has raged, on and off, since before the ancestors of Man, Elf, Dwarf, et alia climbed/crawled/oozed/stepped forth onto the various worlds. In particular, this battle would have been in the late 9th century AD, which is when the pair found themselves in the remote north of Earth Bet. Somewhere under Ellesmere Island, one assumes, is an ancient white dragon's hoard.
His mate set up on Greenland's northwest shore. She is the real reason the Norse settlements on Greenland were abandoned. Unfortunately, her lair is lost, having been destroyed by the under glacier eruption of a volcano on Greenland's northern shore. While the bulk of their hoards were brought with them, some of hers was of Viking origin. It was one of her footprints that the RCAF found outside of AWS Alert shortly after it was founded.
White Dragons are notoriously bad parents. They may teach their offspring a few things, and the young may take advantage of the presence of their parent for protection, there is no affection lost between them. Hunts has been on his own since he was two or three years old. He was actually laired a lot closer to Alert than he liked to be, but as the humans pretty much stayed there, he was safe. After what he assumed was his sire's extended absence, he snuck into his lair, found a few items, and fled back to his. These three items are his treasures; a variant Ring of Invisibility, an Amulet of Proof vs. Detection and Scrying, and Boots of Elvenkind. Sightings of the ghost of Ellesmere dropped off to nothing, shortly thereafter. He had been 6 years old at the time. His dam had told him the cautionary tales about humans; she had not fared well in some of her raids against the Viking settlements, and a couple of encounters with the USAF in the 50's and 60's reinforced that.
Hunts journey south started when someone dropped a rock nearly on top of his lair, about 200kg of iron and nickle. Note that meteorites don't usually come in straight down, they come in at angles, and the proof can be found in the pattern the ejecta forms. Tunguska had a butterfly shaped pattern with most of the damage pointing along the path of travel, west to east. The pattern near Hunts' lair is uniform.
I'll leave it to you, the readers, to speculate on the who, and the why.