Great Bulwarks

In the mountains near Grim Batol can be found the Great Bulwarks, a series of interlocking peaks with an incredibly high metal ore content. The ley line pattern of this area makes them utterly impassable - all things, from lava flows to storms to travelers must pass around the Great Bulwarks, for they cannot pass through or over them. It is from this ley line pattern that the Shield Pattern is derived.