The Wyrm's Tail is a pass through the Yatil Mountains traveling from Krestible in Perrenland to Molvar in Ket.

The pass is a vital trading route between the two nations. Perrenland trades dairy and seafood to Ket via the trail which winds though the pass, the Krestingstrek.

The Perrenland fortress Don Craggen Keep has a commanding view of the pass.

The pass was used during the mid-4th century CY by Kettite forces to invade Perrenland. The invasion came dangerously close to taking Krestible but was ultimately repulsed.