Champion you win.
Before anyone reads this please know that what I've expressed here are my views and this has nothing to do with me complaining about kabam or the 6.2.6 quest in general. The community expects the end game content to be challenging and kabam gave them exactly that and I'm aware a lot of skilled players have done this when it came out but some of us are limited by our abilities so please don't take any personal offense over my remarks. My intention is not to upset anyone.
A few months back i was stuck on 6.2 sinister boss due to a particular synergy missing from my roster but thanks to kabam i pulled Angela as my last 5 star and since i had heimdall so i got through mr sinister easily. But little did I know there was another massive problem waiting for me. He was the champion. Man this guy is hard to fight. I salute the people who explored this quest 100% and fought this guy like 10 times. As for my experience here goes.
After having faced this guy and spending almost all resources to get to 10%, i just realized something , i can't beat him. I mean there was a time when I thought I couldn't do variant quests or labyrinth of legends but i finally did them cause my roster was lagging which got built Overtime with the content i cleared but this guy is not just about that, its the skill that the last 10% requires i just don't have it. No matter how many units i spend. So, i guess this is where my road ends in the story mode and yeah it was fun while it lasted. Back to event quests and arenas for me.
Thanks for reading and have a great day.