Twilight Sparkle to Princess Celestia:

She galloped into the room, setting down her tiara and quickly scooping up Starswirl the Bearded's journal in the process. "From all of us together, together we're friends. With the marks of our destinies made one, there is magic without end!" The Elements of Harmony, bourn upon the necks of her friends, shot out a brilliant light. But without her own element at the center, there was no way for Twilight Sparkle to focus the incoming magic.

All that was left was a pile of ash.