Not the first

"Now, Twilight, this is what happened," Celestia said. "Luna and I needed other alicorns to help control other things, to rule over certain things, to help keep a certain amount of balence. Now, none of them wanted to be publicly known, and ponies would try and become an alicorn, because we ascended a lot of ponies. And then Nightmare Moon happened. The others tried to help and reign her in, and they were seen so many times, but Nightmare Moon was too strong. She was able to banish some of them, well, most of them, really, to prisons all around the world, and used some powerful memory charms on every pony, including myself. Of course, I eventually remembered about them, but it still took me a few years. Orion here controls the stars and galaxies. His observatory is quite impressive."

"Space?" Twilight asked, dumbfounded. "You basically control space?" Orion nodded.

"Yes, I was the first to learn how to navigate by the stars, and I discovered the constellation, Orion," Orion said. "What do you reign over?"

"I'm the princess of....friendship," Twilight said.

"Of friendship?" Orion said with a small frown. "That's a powerful kind of magic. You must be powerful." Twilight shrugged.

"I guess?" she said. "Anyway, Celestia, sorry. You can continue." Celestia nodded.

"I tried to find them, but some of them didn't want to be found. Some of them, I did find, but it is extremely difficult to get there, and others I just don't know how to free," Celestia said. "Like Shadow Bolt, for example. He just does not want to be found."

"Well, he is the prince of weather and sneaking," Luna said. "So of course he would be hard to find."

"Weather and sneaking?" Twilight asked. "What are these other alicorns rulers over?"

"Let's see, there's Orion and Shadow Bolt, you already know what they are princes of, and then there's Heatfront, prince of extreme tempatures, and controls lava so hot, it's freezing cold. There is also Geyser and Blizzard. Geyser is able to control pure heat, and prefers to use boiling hot water, and Blizzard can control freezing cold. There's Mirror. He created the mirror that Sunset Shimmer and you used to get through to the human world. He's able to freely travel to parallel universes, and into the void. Freak is a form of doctor, although I can't remember of what. Burrow is prince of the earth, and can control stones and dirt, and is even able to absorb and become stone. Steam is able to control water, and Roid is prince of strength." Celestia said. "The last two alicorns, unfortunately, I only remember their names. Nightmare Moon's memory spells effected me the most with them. Those two are Ghost Shell and Speed Freak."

"That's a lot of alicorns," Twilight said. "How do I explain all of this to my friends?"

"Oh, they've been listening to this explanation," Luna said. "I was able to send all of what Celestia just said to them, so they heard it all."

"Seriously?" Twilight said. "You can do that?" Luna nodded.

"Oh, yeah," she said. "Now, I'm going to teleport them here, and Orion, you need to teleport us to your observatory." There was a flash of bright light, and the rest of Twilight's friends were suddenly there. Pinkie zoomed up to Orion, only coming up to his pecs, and looked him up and down, with a strange hunger in her eyes. Orion stepped back a few feet in slight alarm.

"Ooohhhh, you're Orion?" she purred.

"Yeah, that's me," Orion said, slightly weirded out. "Why?"

"I'll need to throw you a party!" she exclaimed.

"You don't need to do that," Orion said. "Anyway, to the observatory!"

Twilight's eyes had been wide open when Orion had casted the spell, so it took a few seconds for her to fully see again. She heard gasps around her, and when she cleared the final spots from her eyes, she gasped. They were standing on the deck of an absolutely massive...ship. It wasn't designed like most ships were, but she could still tell that it was a kind of ship, just for designed for space and not water. In the center of it all stood a tall gleaming tower. At the base of the tower was a cube of multiple terrains. Part of it was a grassy field full of blooming flowers, while to the right of that was what appeared to be a beach, full of sand and water cascading over the side of the observatory. The the beaches right were sevral buildings of different sizes and colors. One was made of marble, while one right next to it was made of what looked like a giant pillow. There was another that was colored a sky blue, and other was a pitch black. And the. twilight noticed holes in the tower. She assumed that those were most likely engines, and decided to ask about it later. Suddenly, Orion's fingers were in front of her face, snapping consistently.

"Are you coming?" he asked. "A navigation computer is at the base of the tower, and it has the locations of the other alicorns." Twilight lightly blushed and nodded, noticing that her friends had started walking down a slope towards the base of the tower.

"I'm sorry, this place is amazing," she said.

"Thank you," Orion said. "But if you think this is amazing, you should check out my palace."

"You have a palace?" Twilight asked, very surprised.

"Yeah," Orion said. "This isn't it. This is just a scouting tower. A very small section of the city."

"It's a city?" Twilight said. "Of course it is."

"Oh, yeah," Orion said. "I've been traveling throughout deep space for the past one thousand years. I've had time to do a lot of things." As they reached the base of the tower, Orion called out "Pull up the location list!" As he finished saying that, a giant hologram appeared. A giant map or Equestria. There were 11 red dots on the screen, and one of them seemed to be moving.

"These are the locations of the other 11 alicorns," Orion said. "I'm not sure which dot is who, but this is how we find them." Pinkie raised her hand. "Yes, freaky pink one?"

"Are these other alicorns like you?" she asked. "Or are like, the runt of the group?" Orion frowned.

"What is that supposed to mean?" he asked. "Ah, never mind. We are all similar in body structure. Now, who do you want to find first, Celestia?"