On Arcan creation many people have supported human creation I don't.
First reason arcan humanness. If arcans were made by humans to fight in the war. Said humans would have gone only as far as was necessary to get what they needed. Arcans are to finished in their Physical design. I mean why mix two species. I would compare that to trying to combine two pieces of legacy code that never were meant to go together. Not link, but combine them into a bigger whole. I think it would be easier to start from one base.
Second, intelligence, or sentience, I think everyone agrees that the arcans started out as little better than animals. Some thing like that would not be of help in an industrialized society liked the ancients were supposed to have, they would be good for is manual labor and even then keeping them would require to many resources. They would not be allowed any were near a battle field with that functional level.
Third, variety there are to many different kinds of incompatible arcans. I would think that the military would wait until they had effective arcans until started making other types. With the arcans original level of intelligence, I don't think they would have gone beyond prototypes. Well, Doctor Moreau did, but he was a mad scientist, and didn't have the DoD looking over his shoulder.
Now what do I think could have created them?
1. Experiments with spirit energy before the breach.
2. Some extenuating circumstances when they were exposed to spirit energy during or afterr The Breach.
3. The Spirits.
4. They could have been a pet craze before The War.
5. A "furry" enthusiast could have channeled allot of spirit energy during the breach or maybe spirit energy transformed "furry" enthusiasts
