Some ponies think Diamond Dogs hoard gemstones for the same reasons ponies do. Others think they eat them, like dragons. If ponies knew the truth, they might not be so eager to rob them of their subterranean treasure. If only they knew.
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.
After being banished, Nightmare Moon finds she is able to talk with Discord, also sealed away. The two despise one another, but talking with a hated foe is better than endless monotony. Over time, the two fall in love, up until tragedy strikes.
Princess Luna never asked for a guard to be stationed directly beneath her private balcony, nor did she welcome his sudden appearance, nor could she wait to speak with him again.
It's not easy to go back to your life after a thousand years of insanity and exile. All the same, there's a special somepony that Luna desperately wants to get closer to - all she has to do is get up the nerve to talk to her.
As Twilight goes throughout her new life, she takes care to never forget the special ponies that helped to mold her into who she is, even with the pain that comes with the memories. One pony in particular, however, stands out among the rest.
One night a year, on the Eve of the Summer Sun Celebration, Princess Celestia is sad, at least according to Twilight's observations. She has a plan, a boardgame, and is determined to try to cheer up her mentor.