I think an easy way would be to simply give a nice amount of 6 and 7 star shards in the milestones. Just make sure to tune the ranked rewards properly. With how arena is at the moment, it would be a shame to see those shards in the hands of certain people.
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But paragon should get higher rewarded arenas for the materials like T5 basic and T6 shards etc.
I mean let’s be honest, that’s why most of us do arena anyway.