As long as she has low accuracy, she should be fine. Try if using her speed aura can help speed up a bit but I worried if Doompriest can still work as effective with her current speed right now. I wanted her to be slower than the boss so she can cleanse after the boss places hp burn. Though I am not sure if being faster than the boss is much better. 

I also tried 250+ speed Doompriest but my runs always fail. Not sure if her speed being faster than the boss is the problem since I also tweaked the gears of my other champs when it worked. 

I'm trying Rector Drath now with Vogoth instead of Master Butcher, gonna see how that plays out. 

Wish i had 2nd Vogoth.... Might try Master Butcher instead of Venus too, with all 5 super healers. It didn't work before on other comps, but will try.

Rector Drath buff will add bomb. I don't think it will work. 

When it comes to formation, I have the two Vogoths in the last positions. 

Yeah Rector didn't work instead of MB, gonna try without Venus and with MB and Rector now, but doubtful to be honest. 

Run it several times. This comp rely in rng of Doompriest not getting a crit hit. Now that I remember, I just noticed that my Doompriest have high crit rate 😅 

My DP doesn't crit at all in these runs, this is the latest fail:

https://i.imgur.com/mOwnmj1.png

MB doesn't help, he actually dies quite early in the fight.

You said Master Bucher is going down first on these runs?

See if you can push Master Butcher above 250 speed and put him 2nd to the last position while Vogoth in the last. See if that will work better. 

And replace Rector Drath with someone else. Rector is not really good in this strategy. 

Saw a video of Vrask, Visix and 3 Vogoths. All in Regen set, and it works too. Visix should only use a1 and should have decent accuracy. I believe it has less chance to fail compared to comps with Doompriest. 

yeah you need 3 Vogoths, I've seen that strat as well, just 1 here though.

I was able to get it to work with 3 vogoth (2 in regen, 1 not) DP (no masteries) in relentless (died with 10% left) and Vrask (regen, off/def masteries for CA)

Crimson Helm solo is another option. I've put it in the pinned thread. :D

https://plarium.com/forum/en/comment/topic_1502235/

Ursula  works  for  me,  just  need  to  have  her  hit  the  bombs  with  her  A1  instead  of  the  boss.