Healing
"Why did the Council ask you to watch over me?" Wayvern asked Vulcan that night. They had gone over Canterlot giving Vulcan a tour of the city, and where retired on a balcony in the castle outside Wayvern's room.
"Because of your memory issue," Vulcan said. "I said it before, but you remember everything that any creature living during your time goes through, and you can control what you remember and at what point you remember it. That makes you the most valuable creature in the universe."
"Heh, Did they tell you to watch me in secret?"
"Just the opposite, they wanted me to watch you directly and they wanted you to know that your friend was watching you." Vulcan yawned and stretched his arms above his head. "I should head to the hotel, I'm getting tired." Vulcan left the balcony and was escorted out by the royal guard. Wayvern looked in the mirror. He was in his Alicorn form again, spiky yellow mane and tail, blue fur and eyes, crown cutie-mark and a red collar around his neck. He had taken his gold and emerald crown off a little bit ago; it now sat in its place on a mannequin head in the corner.
It was well past midnight, and Wayvern was just lying in bed, awake as he was when he went. His head was swimming with things he couldn't remember, the Council, Babylon, and one other thing he couldn't put his finger on. Finally he decided to go for a walk. Eventually he somehow ended up back in Ponyville, where Pegasi were working diligently to repair the damage from earlier that day. Twilight was even pitching in with her magic. Everypony was working together so well, Wayvern decided to help. Every time somepony got hurt he was there to make sure that they could still work by using healing magic.
"Why are you helping us, Your Majesty?" one of the workers asked.
"I couldn't sleep," Wayvern said. "I only decided to help because it was partly my fault."
"You tried to stop it, so it's not your fault at all."
"Fine, tell me where you need me."
"There were plenty of workers who were hurt in the Kaiju attack. If you could help them and the other ponies, it'd be a great help."
It was dawn when the rebuilding was done. Wayvern, Twilight and all the workers were worn out from their labors. When they were finally awake enough to continue the day, twilight asked Wayvern a question that threw him off.
"Why did Vulcan call you the most important creature in the Universe?"
"You heard?"
"I was passing by after reporting the lack of casualties to princesses Celestia and Luna, but then I heard the conversation between you two."
"So it was unintentional that you were eavesdropping?"
"Yes."
Wayvern explained everything that Vulcan told him about. The council, from what he remembered, where a group of individual immortals representing each species in the universe. They wanted him to stay safe, because he was important to the future of the universe for some odd reason.