It really depends where you're at, but the Fight is pretty straightforward if you have strong enough Champs. Just don't use Buffs, or Dexterity. I used Hawkeye, and relied on Parry/Block. Don't Evade.
Well it's different due to how you play but there are a few counters/effective Champions to use. Champs that don't get buffs is the best way. Hawkie is a excellent choice. Or a champion who can constantly heal block Void. I cheesed him with a sparky but it took some tries
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It might not be for you, or you might need to grow your roster and mastery more.