Desolate by S. B. Sebrick

The Destroyer's taint thrives in Shaylis’ western mountains, weaving her influence into nature and man alike. The fleeing malagian and felshaw soldiers have little chance of survival. Her ranks recover all too quickly.

But a bright ray of hope appears. Gereth has discovered a way to track the Destroyer's whereabouts. Her path leads them into the heart of those tainted hills, towards a device of ancient power. The battle to reach her is costly, but the price of defeating her could haunt Kaltor for decades to come.