That said, what abilities don't work in light armor aside from Fancy Footwork and the initiative bonus? For example, penetrating strike and challenge don't have any armor restrictions. I could maybe give a reduced initiative bonus to a duelist with light armor, but I can't think of any way to reduce the benefit of fancy footwork for someone in light armor while keeping it meaningful. Or would you suggest just making that fully available, and the only difference between light armor and no armor being the AC and initiative numbers?
Oh, yes, I think I must have been thinking of simply fancy footwork. While some form of "limited fancy footwork" would be great, I can understand the difficulty in implementing something like that.
I understand the idea of "graduating out" of light armor use, and actually now that you put it that way, I more or less have no problems with the class.
Easily one of the best, if not the best Duelist rewrites I've seen. Nicely done.