Clover the Clever was a unicorn and a royal advisor of Princess Platinum. He was an orphan who was adopted and raised by his mentor, Star Swirl the Bearded. As a personal protégé, he learned lots of magical spells. As he was aging, he accomplished many missions and notable work. There was one problem, however. He was part of the unicorn tribe, who had a great hatred towards the Earth ponies and Pegasi.
Meanwhile, a unicorn named Xoone was learning magic as well. She was learning magic from an evil wizard named Maledus. Xoone was his personal protégé, and she was very advanced in magic. However, Xoone made many mistakes that upset the other unicorns. So, she grabbed a random rock from the banks of a river, enchanted it, and gave it a design. It was called the Memory Stone. With it, she was able to erase any memory. When Xoone first created the Memory Stone, she erased only little things, like Wallflower Blush. That definitely included her clumsy mistakes. As time passed, she realized she was gaining more power with the Memory Stone. And once she realized that, she erased even more memories. Pretty much everything that was important to the other ponies.
Clover the Clever heard the news about Xoone, and knew he had to do something about it. First, he asked the evil sorceress what she was doing and why. Xoone ignored his warning, and continued. The more she erased memories, the more Clover got angry with her. He made a plan to destroy her Memory Stone. When Xoone realized that he was going to do that, she ran away. But Clover chased her, all across the land. When he got close, Xoone erased his memory and escaped. So, Clover wrote notes to himself to remember what was going on, and where Xoone has gone. One day, he catched up to Xoone, and tackled her. The Memory Stone went flying out of her bag, and she used her magic in hopes it would stop it. But the magic only opened up a portal to another world. Xoone went through the portal, and Clover chased her.
The portal led both of them to a human world. The Memory Stone was the first magical object to enter the human world. Later, the Time Twirler entered the human world. Xoone erased human memories as well, and Clover still had to defeat her. He spied on her when she was using the Memory Stone, and figured out how to use it. One night, Clover the Clever stole the Memory Stone. Xoone woke up. They tried to receive the Memory Stone from each other, but when Clover got a fair hold of it, he erased all of Xoone’s memories of the Memory Stone, and now she couldn’t erase any more memories. Clover then decided to bury the stone under a rock formation. He used a portion of his writings that he had written back in Equestria and wrapped it around the Memory Stone, so that whoever dug it up would realize that it was dangerous and should not be used. Xoone was forced to stay in the human world, while Clover was able to return to Equestria.
