The Zashik Wall

Not actually a continuous wall, but a series of shield forts that cover the whole length of Caussaulka's northern border, and a little bit farther than that.

The vast majority of Cassaulka's standing army is stationed in or near these forts, waiting for the inevitable Northling attack. or raiding party that attempts to slip between the pickets.

The Godcrafting is so deeply woven into these forts that their north facing side is permanently encased with a mystical ice that can even withstand cannon fire without cracking.