At the start of battle, Revna will grant herself Rush Buff which allows her to deal 50% of target max health to all enemies. This buff only last for one turn and unless you land an aoe skill, will not be granted to her for the second time. So, don't land any aoe attack on her. Sounds very dangerous, right? But actually, you can take advantage of that by activating sigurd schyte artifact which increases attack and absorbs some of the damage as health. Also another artifact which increases its ability when the health is low, ex: noble's oath.

Revna will attack the one with biggest max health first, landing decrease speed debuff which can't be resisted. Better to dispell it quickly, cause she hits hard and deals additional damage.

Bring sturdy heroes, at least each one of them can survive four attacks and additional damage.

Watch out the debuffs, cause the minions will debuff themselves then transfer it to all of your heroes. Better not defeating any of the minions, cause it will increase Revna's combat readiness increase by 5% per minion.

Revna will steal any buff so easily. So, better to not grant any buff to your heroes.

Revna can attack stealthed hero. So, defending a hero by it is impossible.

Better to not land any debuff on Revna, cause she will cleanse it then grant herself a barrier. Not a very sturdy barrier, but better without it.

Focus on defeating Revna, and then clear the stage.

Time to try!