Luna has returned after 1,000 years only to learn that she has missed saying goodbye to her dear friend Snowdrop. As the last snowflake falls, Luna decides to say farewell.
After the Crystal Empire is freed by Twilight and her friends, Luna realizes she must say a final goodbye to someone she thought had died long ago. Deep in the caves beyond the Empire, he waits for her.
When two unlikely ponies, Luna and Sombra, meet beneath the silver moon, will their love be everlasting, or will the darkness lurking in the Crystal Empire succeed in destroying them?