Raggenrökk was a myth. An old wives' tale, to scare young Hyoite children into behaving, lest the firebeast burn you alive like it did the old wizard that used to live in the tundra, hundreds of years ago. There was nothing really there to melt tracks in the snow..
So what was making those tracks? They were too big, too refined to be anything from an animal, and wearing a set of metal armor capable of making those tracks was a death sentence in this cold weather.
It was Raggenrökk, although nobody would ever dare say it. It was a wordless sentence that floated around the homes of nearby villages every time children would run back, terrified of the three-pronged indents in the ice. But it existed. Raggenrökk existed and that was a terrible curse everybody had to realize they lived with.
Raggenrökk stalked through the icy valleys, its steps moving with expert dexterity and precision.. At least, it had to be made by an expert from the way each step was uniform; left, right, left, right.. Not to mention the trashed wooden sleds, pieces of it ripped off, ash replacing it a few steps later. There was only one thing that could burn something so quickly in such cold weather.
The old wives' tale of the anvil golem, Raggenrökk.