The fight begins partway through the first phase because a notification from a friend popped up at the top of the screen earlier.
This is not a damage showcase. I simply wanted to show my experience with the battle and how Acheron can almost spam her ultimate since each death from a small bug adds a Vulnerability debuff to the boss.
Aside from Black Swan, no one is fully built; i.e. traces and/or relics aren't maxed. Acheron is using her signature light cone but it's level 56. ^^
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