Stormbringer would be so awesome to recreate faithfully. From what I remember: Massive, black, two handed, double-edged, though it moved like a rapier. So one handed, in the game. I sort of remember reading that it was like 6' total in the books, but that seems ridiculous. It sang, shreiked and growled in battle, some fun sound files to make. Emitted a dark glow, like a poisoned or flamed blade, but black. Alien craftsmanship, jewelled hilt and pommel very strange looking, deep runes on blade, glowing. Chaos symbol on hilt, I think. Weak enemies would often run in fear just seeing it, they would have to pass mental resistance or run in fear or paralyze. Takes and gives wielder health AND mana from each successful strike. There would somehow be a chance of it attacking allies, moving unpredictably. In large battles, it becomes "sated" after too many kills and loses all of it's powers altogether. Also, I'm not sure, but I think I remember certain "undead" type soul-less creatures that the blade is useless against because it craves/ feeds on souls. Stormbringer and Mournblade were basically powerful demons trapped in, or in the form of swords. It would pretty much be a God item, that would need really hard modules/creatures to be fun.
