Just want to share my team to proof that you don‘t need expensive thunder (ranked) monsters to beat it

Opponents by the way

I did it with 2 epics and 1 Legendary. Voltaik, Kaori, and Volray.

The last fight took a bunch of tries but I finally got it done.

I needed around 20 tries. Uria’s BG should be normal stunned and Ragnarok should be mega-stunned, only then it‘s kind of possible (I have no idea why I managed to have all three monsters alive).
By the way, how could you use Voltaik ?

I reskilled Voltaik to not have the extra turns. And it took days, literally. Spending all my stamina for several days. I'd guess over 50 tries total.

@stein wait how do you mega stun ragnarok?
Edit: nevermind I found out