The Beacon at the Top of the World

From the introduction:

As with Midgard’s many death cults, the Children of Surtur seek the extinction of most life on the world while either surviving through to the new age wrought by their actions or dying in a simultaneous and glorious extinction. The Children of Surtur’s plan is to engulf the world in flames. Their leaders determined the most effective first step was to melt the hated ice at the top of the world. This would create an apocalyptic flood to devastate the Northlands and much of northern Midgard.