You need to go with Skimfos if you end up trying one of those epics from your list. Basically an ATK team cleanser with pretty reliable self buffing, self heal and high multipliers, as well as an ATK DT Aura. Build him with an insane amount of speed and maybe HP/RES/Crit rate. 

And thats not a bad idea, I plan on using Turvold, Skimfos, Whisper, Basher and CH when I get there.

There's no point in running a cleanser. If the other team gets turns to attack without CC, I'm dead anyway. None of those champs can survive. I'd be equally doubtful of your idea working - these guys aren't just pushovers, they're very tanky and hit very hard. If you have a video or post from someone demonstrating that possibility without just absolute god-tier gear, I'd love to see it.

As I mentioned, the suggested teams all involve either Gurgoh or Chaagur, because of the reliable CC they bring. There are literally no epic or rare void ATK champs with AoE CC :/

Believe me, I know. But you never know what you can do until you try it, but a second CH in stun or Skullcrown in stun, with her A1 should be pretty reliable. If youve got Vlad, then make him faster for his A2 that should help a lot. Skimfos has excellent base stats compared to others lol I wouldn't sleep on him if I were you.

BTW- how did you do SR12 for normal? Actually the only one on normal I havent cleared yet😂

Haven't reached there on normal yet, but most normal secret rooms I just run on full auto. IIRC, SR12 normal was just Bellower + Coldheart + Reliquary Tender, but really, I think it was just Bellower.

As for the other comment - I am definitely not planning on leveling a champ to 60 and fully gearing it, along with two others being fully re-geared, just to try it :) Looking for someone else to have done it already so I know it works first.