Emperor's Blade just punishes burst ops unless you know how to bait his dominion attack, which depending on the map, will be lethal or not.

For frostnova, there are two things which make the battle hard: ice crystals, and rng favoring her over you.

Faust is just straight up fast deployment, with the last one tanking his shots. Otherwise, you'll be spamming fast redeploys to tank purple shots.

For talulah, fighting her while there are stupid civilians in the map makes everything hard. Otherwise, just bait her ignite attacks and pray that you have enough magic resist to survive her hellfire attack.

Patriot is straight up beef. He's too tanky, obliterates almost every melee op in front of him in 1 to 2 swings, blasts range ops easily.

So for me, from hardest to easiest, patriot > talulah > emperor's blade > frostnova > faust.