There are rewards for normal difficulty if you fully explore it by September 4th. Nothing crazy, but more than nothing. It's also permanent content, so when your roster improves you can go for the better rewards.
There will be 3 reunion tokens and collecting all 3 will give you the opportunity to get the 7* reunion selector which is the crucible crystal champs.
According to kabam crash Thornbreaker to valiant can collect the 7* selector
Are we sure the Crucible crystal and Reunion crystal are the same thing?
Yes kabam jon said the crucible crystals will contain reunion champs so from selector u could choose a different champ or dup or whatever after the crystals u get from the event
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According to kabam crash Thornbreaker to valiant can collect the 7* selector