Proving grounds
I've heard ppl mention them, but what are they? I've been at level 85 for almost a year now and I'd expect to find it at some point, but I got nothing on it, so what and where is it?
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If you have slkr, you can beat most proving grounds events. Maybe not 3 star but easy wins.
Sadly I don't have any GLs yet. Closest I am to one is SEE and that's only with tie bomber done.