Highstorm

The Highstorm is a primordial, created before the dawn of time as a manifestation and bringer of storms, lighting, wind and rain. All storms that shake the world, all hurricanes that ravage civilization and all the rage of heaven is born from the Highstorm, a rolling monstrosity that seeks to destroy the world beneath it. The Highstorm was deceived by Memnor and captured in chains forged by Surtur, while Grolanthor held it in place.
Today the Highstorm continues to shake at its bindings, sending terrible storms to destroy the world. If released from its chains, it would wipe out surface civilizations in a hearbeat, with winds faster than sound crumbling mountains, devouring oceans and ripping flesh from bone.