I have considered writing a fanfic featuring the Tainted Coil after Eddie's victory at the end of Brutal Legend. If there's actually interest for this, please let me know. And feel free to suggest ideas if you actually do want this to happen.
One idea I've had is to make it lead into Rhapsody( of Fire)'s "Emerald Sword Saga" as a lot of ideas overlap. Special notes would be the Kron dynasty as the last vestiges of the Tainted Coil (perhaps the fic would follow the first of the Kron rising up in the wake of Doviculus' death) and references to "the dead" indicating tear drinkers. I'd have to explain what's up with the elves and dwarves, though. But all that's just one direction I could take this.