Ulm beefed up ...

[Taqwus]

Hm, steel's metal. I was under the impression that metals tend not to be good electrical insulators.

However, it might not be unreasonable for black steel to be perhaps slightly fire resistant (perhaps only Ulm knows how to work with such a metal if so), or very strong for the weight and bulk (perhaps less encumberance, less reduction in AP and defense?) or harder to penetrate (perhaps AP effects reduced).

Perhaps the forgeable black steel items could also be forgeable by Ulm only. 2E mages aren't exactly confined to Ulm right now.