When Borbarad, the great evil ... baddie, invaded the area of Tobrien, and destroyed so many towns, castles and fortresses which could or would stand between him and his goal - the ultimate corruption, and corrupted so many things, when he invaded the land of Tobrien, he and his troops also destoyed the fortresses of the Amazons. Kurkum was one of their greatest fortresses.
The Amazone of Kurkum must be one of very, very, very, very few survivers. Almost none survived.
A fraction of them must have been corrupted.
There are archdemons which represend an corrupted opposite of the Gods of TDE. Rondra is the Goddess of War, and of Thunder.
A group of Amazzons must have been corrupted by that archdemon, so that they went into a pact with the demon (first circle of damnation or even firther), thus owing their souls to the demon.
The group of enemies from that quest is an example of such demonically corrupted Amazons. To defeat them is quite an achievement for the *real* Amazon, which might very likely raise her reputation in Rondra's point of view.