Talk:Magic/@comment-33091403-20180611005629/@comment-29981995-20180703201343

Presumably it was cartoon physics; we have yet to see any indication that the Mane 6 are capable of taking on their Rainbow forms on again. That bit from Luna's dream in Do Princesses Dream of Magic Sheep? could have been an assumption on Luna's part or even just something the Tantabus whipped up. After all, what could be worse than the power that beat Tirek failing to stop a returning Nightmare Moon? Plus, if they could employ that power at will, you'd think they would have called upon it more often...