Seeing as Grand Arena is the same as normal Arena/PVP, just offering more squads than the standard "one" squad, I don't see how guild membership matters.
Understand. Guess only other noticeable thing is that GA isnt located in the guild area but, rather, in the main area. That kinda shows guild as irrelevant to it. Best of luck
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That's really my question. The merc part is me just thinking out loud.
Never mattered in Arena before...