for this we need 2 rangers and 1 mage.

The rangers:
they must have flying daggers and immobilizing spells, lots of hero dmg spells, and must save the remove opponent unit spells for charuns and (pegas), but charun is essential here, he must get buffed with "writh of death" so he can do lots of dmg. When Charun is ready rangers will clear 1-2 blocks for placing him and for buffing him.
Its all about staying alive as long time as possible to set in the Charun attack.

The mage:
Mage must have frost staff and lots of freezing and weakness spells, also he must have free mana spells, to build up his torture capability fast as possible. He must save the flying for charuns and else his job is just to stay alive as long as possible for torture momentum.

I have posted the decks needed, they can be edited a bit, but this pretty much sums it up, i hope it helped and you can clear it now.

Hints* The key to succes with this tactic is to immobilize, stun, weakness, freeze the bosses' units that hurts the most, try not to hit the ones that gain rage when you hit them because if needed for another lane this unit will be terrifyingly mad and hurt alot. As i explained its all about staying alive for charun attacks, lots of communication about who and were to put spells, and who get charun, who get the buffs or spells first. Communication is a must, when you have cleared this once, you will get better. We all have failed at this at one point and gotten better don't give up hope. If any questions please ask and i will answer the best i can :) god bless

GL HF
Best Regards and wishes
Snowbee and Kingdom