Probably the Nameless Thanos from 2019, I remember spending like two weeks in the quest with just him because I couldn't get a solo and had to chip him down by going into arena for units. It was the biggest grind. Luckily when Kabam brought Nameless Thanos back for that Boss Challenge last October I was able to get a solo with my Hyperion
5.4.6 Ultron. I hated that fight. I spent thousands of units doing that quest exploration (that quest cost me more than exploring whole rest of act 5).
Just did this fight yesterday with a 3 star loki.
Now I feel bad for my team of maxed 4*s For me the most rough part was the evade. Anything else was fine but the evade rekt me so many times
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Each fight was a crazy amount of hits and she would regen it all the way back if you died.
Your deaths were usually to an evade, or her quick recovery time.
Most annoying: abyss invisible woman with
Molegod with 1/5 deep wounds. True pain.
I spent so much time trying to solo him with my 5* Rank 3 HulkBuster. I remember my mom telling me to stop playing because we were at a wedding
Eventually I got lucky with a solo and Convention Clash Champion was an easy one shot with my Sym Supreme