They stopped right in front of the palace, much to the guards shock since they knew of the rogue dragons' attack on Drakeria. Luna was surprised too.
"Your highnesses!" Luna gasped, greeting them near the front entrance. "Uh..."
"Greetings Princess Luna, it is wonderful to see you again. Twilight and the others already explained of your return and we are glad that you are back to your old self." The king bowed.
Luna smiled gratefully, then turned to Twilight as she, Applejack, and Pinkie Pie reached the ground.
"Did you...?" Luna hesitated.
"They're right in our saddlebags." Applejack smiled.
"Then hurry, we must cure my sister." Luna lead everyone into the palace.
Zecora finished the potion and gave it to Celestia. While they were waiting for the potion to work Spike, his parents, and Twilight and the others told Luna and the guards of their journey and how the rogue dragons were defeated. Spike and Rarity becoming a couple did cause Luna and the guards to be taken aback, but they also were proud of the bravery and selflessness the group showed during the journey, especially Spike and Rarity's.
"Tales of your deeds will arose." Zecora said. "For you are all truly heroes."
A few minutes later, Celestia came out into the hallway.
"Princess Celestia!" Twilight said happily, going up to her.
"Sister, you're okay!" Luna followed Twilight.
Celestia hugged both of them.
"Thanks to Twilight and her friends." Celestia smiled proudly. "My dearest student, you have proven yourself to be the most heroic pony ever, and you deserve a special place in court with me and my sister Luna. I understand that Ponyville is your home now, so I've figured out a way you can be part of the court without leaving Ponyville for long."
"Me? A member of..." Twilight was beyond stunned.
"A member of royalty." Celestia smiled. "You, Twilight, will be third in command. If such an occasion arises when neither I nor Princess Luna can be on the throne you will take our place and handle affairs of state."
Spike and the other ponies gaped at this scene. Twilight didn't know what to say, though she didn't look very happy for some reason.
"I am beyond honored that you would give me this treasured position...but I cannot control the sun and moon like you or Princess Luna." Twilight said regretfully.
"Oo, as much as I would like her to be a sister to us she does have a point." Luna winced.
"I have thought of that too." Celestia smiled. "Whenever Princess Luna and I are both unavailable the sun will only partially set, allowing light for ponies to see by without the world becoming too hot. We will call this new part of day twilight after the pony who will rule during that time. To mark this new part of day you shall decorate the sky during sunset in any way you choose."
"Thank you, I never expected anything like this." Twilight bowed her head, smiling.
"Wow Twilight, now we're both royalty." Spike smiled.
"Spike! I am relieved to see that you are all right, I was worried about you." Celestia walked over to him.
"He's more than all right." The king smiled.
Celestia turned and saw him and the queen.
"Argider! Horatia! It is wonderful to see you two again. I am relieved that your kingdom is finally free of those rogue dragons." Celestia smiled.
A.N. Argider means 'beautiful light'. Horatia means 'hour' or 'time'.
Celestia then expressed how proud of Spike she was, and also congratulated him for winning Rarity's love. She explained that she overheard everything through the door while she was recovering.
"Say, dad, how come a few members of our kingdom have unique names while I have a common one?" Spike asked, curious.
"We named you after your grandfather, my father. 'Spike' was his nickname and his most well known name due to his remarkable fighting skills." Argider smiled.
"Oh, cool." Spike smiled.