Talk:A Royal Problem/@comment-1031724-20170520181303/@comment-24659719-20170520233234

with switching Luna's cutie mark to Celestia the black part was included because Celestia is white, the same colour as the moon in Luna's cm. so to show that properly the entirety of Luna's mark had to be transferred to Celestia. this also gave the opportunity to finally show the dark side of Celestia. when Luna's magic was transferred to Twilight in Twilight's Kingdom part 1, I believe that it was Luna's Alicorn Magic which granted her power over the moon, and not her Cutie Mark Magic that is associated with shadows, darkness and nightmares. even Tirek couldn't take that from Luna. Starlight however was dealing exclusively with Cutie Mark Magic which is why she was able to transfer all of Luna's mark to Celestia.