The Soldiers of the Sanctuary are a group of elves that defend the Sanctuaries. Florian Greenheart was a lieutenant. They are highly trained acrobats and dangerous swordsmen, and were given the task of preserving magical creatures from the Glorious Empire and to save beings of magical origin.
The soldiers can be annoying to deal with, as they will frequently move about to escape and can be a pain in large groups. A good strategy is to lock onto them and quickly use a small burst of magic on them. This will shock them, bringing them to the ground. Then, you can perform a killing blow to dispatch them for good.