Deacons of the Deep technically uses an Epic set though not for the intended damage type so I am hesitant on if it should be included 
. As to what it can do - I have completed SR 65-66 with it, completed Gladiator 150 with it, killed Lokarr and Morgoneth. I’m confident the other Nemeses and roguelikes are doable as well.
Conversion items used: Conduit and Korvan Burning-Blade.
The Lion of Stuttgart is another old build I posted for Stonefather but looking back at it now, I heavily dislike how glassy it is, even after the Demo defense buffs, so again, hesitant on whether it should be included or not. Roman was still able to push it through Crucible 150-170 but he has pushed glassier things through so take that as you will.
Conversion items used: Gargoyle belt and Phoenix rings for global Pierce->Fire conversion.