wintersnowing's Lair

The giant, chilly expanse of enormous arcane spines rising from the sea just south of the Starfall Isles is barely habitable. It's too cold for the Arcanist, too thaumatically charged for the Icewarden, and so it stands barren... mostly. In truth, this area is home to the Corundum Collective, hidden within a massive pillar of magical energy carefully hollowed out from the inside. Its inhabitants are a carefully selected group of magical vigilantes and scientists... but why are they there at all?