I was playing Oblivion the other day and I have to say I enjoy using Dawnfang/Duskfang & I thought wouldn't it be cool 200 hundred years later to come across the two crystals that are apart of the weapon in a dungeon somewhere which starts a quest. You have to go to a number of blacksmiths to track down a rumor of someone skilled enough to forge them into a weapon. After you visit a few smithies you piece together the location of a hermit smith who lives off somewhere & when you go to him, he/she gives you the option of:
A - Puting both crystals into a 1 handed sword, mace or axe.
B - Puting both crystals into a 2 handed sword, hammer or axe.
C - Puting each crystal into a seperate weapon, ie. one crystal in two 1 handed Shortswords, Longswords, Axes, Maces or combo of both. (Each weapon is slightly weaker then having both crystals in single weapon)
That's just what I thought would be cool. Put your ideas in.
P.S - Love also to see the Staff of Magnus & Chrysamere in Skyrim.