I believe the unicorn is for a daedra shrine quest.
I killed some of these... ranger looking mobs around Anvil. (overhaul turned the County Anvil region into an insanely high level zone) First they attacked me, then chased me for half an hour. I was finally able to lure them into town where they killed AT LEAST FIVE GUARDS. They were finally taken down, and I looted their epic light armor. Then, all of the sudden, WHADDYA KNOW? The armor is enchanted. It hurts whenever I attempt to wear it, then takes it off immediately.
On the bright side, I was able to use the bow (Braided Bow) and the arrows (Braided Arrows).
The bow's damage is 10, and the arrows are about 8 damage. If you're good at the game, you can really benefit from overhaul! :D