Doubt it. Unless "Arena" is a Guild for Oblivion.
Lvl 19 now, still in Steel, still meeting only Mythrill enemies
WTF moments:
1. Some random ruins. I look at some zombie at a platform, savely locked behind a big door. I turn away and open a door to another part (map/loading) of the ruin, which turns to have a door right away which could only be opened from the other side. So I turn around and... see that freaking zombie How the hell could he come of his platform if he was locked out with a sturdy door I could only open with a trigger...?
After dying from this surprise in my back I tried it a few times again, but never did mister zombie actually turn up in that room again, which is... logical.
2. (current save) So I killed a female bandit. Since it was in the sewers of the Imperial City and I could easily dispose her equipment I took all her Mythrill stuff. This encumbered me though, so I left behind a glass dagger (her glass dagger) with her and went up to sell it to some merchant. Now if I return WTF is going in effect:
Even if you see the glass dagger, it ain't there. If I give her some (any) equipment she happily dupes it... unfortuately looting it from her only gives one copy back so it doesn't really help, but surely is odd.
If I continue further into the sewer she suddenly has the glass blade again as steal-able object. Still trying to experiment with her (since active save) and see if the dupes can be made "permanent"