That’s something I have done long time ago, fire N&O Infiltrator with Beronath Strikes+SS and I think rings with cold to fire conversion. (which are awful btw) These days Censure have lower RR but you can use Ember set instead.
Fire Aura Infiltrator is also possible DW or with shield with Censure mod.
Fire Infiltrator: 
My humble contribution:
Voracious reach Cold Witchblade:
https://www.grimtools.com/calc/JVlvLBRN
This thing drinks energy potions like it’s trying to forget past trauma, but is otherwise immortal in campaign (2.5K+ base health regen and a lot of life leech)
Could definitely be refined and improved, but I just killed Alkamos with it, so it passes the test. (sorry, I haven’t figured out how to record gameplay yet)
I like it. For Energy perhaps use Harp (with or instead Scythe). Not sure because you have 3 points not spent in devotion window. And no component in weapon? 
Yeah, it’s still a WIP. Don’t really know where to put those devotion points and am still undecided on the weapon component. Harp needs a lot of yellow devotion, so I would probably have to give up Yugol (which is thematically inappropriate 
) Scythe is the compromise I found… though if I could get harp without sacrificing Yugol, I’m all for it
Harp only needs 3 yellow and gives you 2 yellow back. I’m not talking about Scales. Scales ruining devo setups that’s true. You don’t even need Lion then.
Do we have Reduced Target’s Resistances here or am I blind?
Open hand of mercy 12%… better than nothing, but yeah, I could include Viper
This doesn’t work, I don’t the % one - which doesn’t work anyway because it scales with % weapon damage up to 100% and you only have 35% weapon damage on VR. Which is not that big of a deal because % Reduced is not that strong.
I mean X Reduced Resistances - it’s a totally different thing. Perhaps I don’t see it.
% Reduced doesn’t compensate it in the slighest
I might not have any, yeah.
I mean… I threw this together yesterday evening after I put the kids to bed, and tested it today on my lunch break
it’s probably full of holes like that
Don’t worry, even 3 points in War Cry Transmuter is for 18 reduced is an ok fix.
https://www.grimtools.com/calc/p25OeEyZ
Health regen took a hit, but I have 3 sources of RR now
You could also put Storm on War Cry for 100% chance. I’ve been thinking of Scales actually which would be 1) healing 2) energy regen 3) Reduced Resistances in one. Not sure, you’d need to test what you like best: https://www.grimtools.com/calc/gZworqjZ
Scales healing would be good because it doesn’t have stupid 15 seconds cooldown like Giant
Could work. I already have 100% vitality to cold conversion anyway
Remembered this acid BM by @fordprefect. >1.1.9.1< Son of a Slith, 2H Acid Blademaster. SR 75-76 (Beware Meme Hazard)
I’m surprised Lightning Witchblade isn’t fulfilled yet, has no one really posted an elemental cadence build with Scion of Arcane Force?
Here’s mine: https://www.grimtools.com/calc/eVLjx44N
Might not be the best, but Seekers/Currents and 6 crafts (for +% Armor) make for a fun time! 
Lightning Witchblade
Acid Blademaster
Bleeding Death Knight
Here’s some more of my successful builds to add to the list.
Vitality AAR Warlock:
DW Gargabol’s FS Vitality Pyromancer: https://www.grimtools.com/calc/nZoaLek2
DW Phasebreaker FS Elemental Pyromancer: https://www.grimtools.com/calc/O2Ggx5j2
Meme DW Ranged FS Cold/Acid Saboteur: https://www.grimtools.com/calc/1NXax182