Over 3 hours wasted trying to even chunk away 1/4 of the boss's health.
It's not a skill issue, my team (one of them is a GR11 & pretty sweaty) & I know the mechanics of the encounter and have decent meta builds for ad clear & the damage phase.
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If it's impossible, how come thousands of other players have managed to complete it? If you're struggling to complete it, I recommend looking up guides on YouTube so you can learn the mechanics and strategies.