Galeforge

Galeforge, rendered Fjltindas in Udur, ...

It is said that an arrow fired from the forge of winds drawn to it's full would pierce through the spine of the world.

no mortal can draw it, but they don't really need to, because if you nock an arrow and pluck the string it will knock down a castle wall

down side? the rush of wind created by it's use will kill any mortal who wields it, and throw the bow itself along for the ride. It's a super-weapon that can be used only once (by mortals). It's currently lost. Thrown by it's own power somewhere beyond the northern mountains.