I think Deej had talked about this in an interview with Holly from PlayStation Access. What is in the image is actually a shard of the Traveller which is located near The Farm where Hawthorne has been living. Possibly this is how we get our own Light back as mentioned by Zavala: "If the Light returned to you, perhaps there's hope for us all". Maybe one of the first missions after leaving the ruins of the Tower and after going to Felwinter Peak and the Iron Temple.
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