Art by  thecrazydragon
You can fave the artist's submission here: https://www.furaffinity.net/view/58218416/


My big handsome (dumb) boy, the middle sibling of Celestia and Luna, Sleipnir. A jovial earth pony with the strength to move mountains, and vines full of gemstones for a mane and tail, he joined Celestia on her journey across the world in the Time Before Equestria, and helped temper her ferocity. He was the intermediary between Celestia and Luna, defusing their arguments and reminding them to work together as siblings.
They adventured for years and years together, creating the basis for the future legends of Morgan, Titan, and Sol, until the fateful day they reached the Gray Mountains and battled the monstrous Fenrir...