The Stiehl Assassin (The Fall of Shannara Book 3)

The Skaar have arrived in the Four Lands, determined to stop at nothing less than all-out conquest. They badly need a new home, but peaceful coexistence is not a concept they have ever understood. An advance force under the command of the lovely princess Ajin has already established a foothold, but now the full Skaar army is on the march--and woe betide any who stands in its way.