I hate to sound like such a wimp, but I can't imagine how long it took you guys to first figure all this out.
I have the gloves, breastplate, belt, shield...the dwarf king says he'll give me the helm when I have the rest. Grisha repaired the breastplate, but didn't ask about the Dragonheart (which I also have). When I go back to the king, he just tells me the legend of the armor, no longer mentions the helm or upgrading.
What am I missing?