Well, your Wakka was probably signifcantly stronger than mine. My challenge was actually the actual challenge was WONCNARRSONENNE, the RSO part in that acronym being Red Spheres Only (so no extra 16 strength from the Goers match and Lightning dodging). I think I remember running the math, and I would have needed to grind until the end of Wakka's grid if I wanted to do it without AR, and still pray that both characters survive the first round (or hope for an 1% Pain resist).
I never did finish that challenge. I think I lost interest during the pre-BFA preparations.
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Everyone should post like this