I wouldn't mind that too much. Finding weapons in the world is very common, that's not a bad thing. The issue would be if they put it on some random, uninteresting, boring location. In DMC1 they made it epic when you found a DA. They spoke to you and then they tried to kill you and Dante would be all 'hehe
. No:devil:
'. In DMC2 the amulets looked like they were trying to spear you. It doesn't have to be bosses converted to DA (which in itself isn't a bad idea but, honestly, it was a good concept in 3 because it was different from 1 and 2, but I'd like something new, now), as long as it's epic, I don't mind, but if you specifically say that the weapon came from a demon and you don't show it, specially when you call them Lucifer and Balrog, that's so not Raven. I mean, come on. One's the devil himself and the other is one of the most iconic and impressive creatures from the LotR, could you be any more of a c' tease?