Great question! In my case, I feel like i'm just not knowledgeable of the game enough to level into the high 500's. I'm dwindling down at 512 or something. And have no idea how to increase my numbers, and I DO play a lot!
If you find out, please give a shout!
English
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I know, if you want to increase your light, only run activities that reward "powerful gear" as reward which is stated when you hover over the activity in the world map.