[Spoilers] Obito's third power.

[Wabisuke]

Double Kamui allows you to travel between dimensions.
He could pay a visit to DBZ World, collect all Dragonballs, go back to Naruto World and solo Kaguya.[SUB]

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if Obito got the dragon balls, he would wish Rin back

 

[Almighty Ra]

His powers are amplified because those are his abilities as a Uchiha so it's natural for him, He has both his eyes back which automatically boost up his Kamui to how it should have been.