It showed a castle all decorated in colors celebrating a new ruler who has come of age. Everyone was excited.

Everyone would be there from different lands/streaming services, from the Hulu kingdom, Netflix kingdom, Disney kingdom, Nicktoons kingdom and everywhere in between near and far.

There was food, games, music and all sorts of fun until the ceremony begins which will start when Celestia and Luna walk onto the stage, accompanied by the sound of horns signaling that the ceremony will begin.

Luna was pacing while Posiden was watching "I can't believe this! I just can't! It's too soon!"

"Calm down Luna. She'll be just fine." Posiden said trying to calm down his wife.

"It's not that Posiden." Luna said "What if she can't make a good decision or make a decision that'll effect the courses of equestria and Atlantis."

Posiden said putting a good on her shoulder "If she can't believe in herself, we'll be there no matter how long or much she'll have problems with."

Luna sighed "You're right. Now let's get ready."

Luna and Posiden walked down the hallway, they were also being met with Celestia and her husband, Helios, and Twilight sparkle with Flash Sentry, Princess cadence and Shining armor with Flurry heart.

The horns sounded signaling that the coronation's starting. Everyone looked up at the patio where the princesses stood.

Celestia said starting the ceremony "We are gathered here today in celebration a momentous occasion, my niece, Luna's daughter Dreamworks moon has done many extraordinary things since she's lived in her own kingdom. She has done things no one or pony has done. She has many skills, and many ideas to make things better. She even kept nightmare moon at bay so I may keep seeing my sister, Queen Luna. But today Dreamworks moon did something extraordinary, she created new magic proving without a doubt she's ready to be crowned her kingdom's first princess. Fillies and gentlecolts, ladies and gentlemen, may I present for the very first time, Princess Dreamworks moon!"

Dreamworks came out with a fancy dress and a choir behind her

They sang as Dreamworks went up to the patio as Brock-a-lonely walked up with a pillow with a crown with her cutie mark on it. Celestia put the crown on her head. Dreamworks looked at her friends as they smiled. Dreamworks looked at the crowd as she waved.

"The Princess Dreamworks cometh
Behold, behold
A Princess here before us
Behold, behold, behold
Behold, behold (behold, behold)
The Princess Dreamworks cometh
Behold, behold (behold, behold)
The Princess is
The Princess is here!"

The crowd cheered.
Princess Celestia said "Say something, Princess."

Dreamworks said "Oh. Um... she clears her throat "A little while ago-" she was interrupted by screams and black rocks. Luna said "Quickly! Get inside!" They all ran inside but then black rocks covered the windows preventing anyone from entering or exiting. Everyone panicked then someone nobody expected to see was...Cassandra.

Cassandra said "Swell party. I'm guessing my invitation
got lost in the mail?"

The guards snorted.

Helios said "I think for the next party I'd like to have at least some input on the guest list.

Cassandra's blade rings as it slides across the floor making everyone cringe at the sound. "If you don't mind,
I'll just help myself to a slice of this cake."

Bing asked as he had a bucket of popcorn "What does she want? Why show up here now?Is she here to apologize or for a fight? She's probably here for a fight."
Beep said "Quiet!"

Dreamworks said "It's..." She sighed "Where have you been? Rapunzel's worried."

Cassandra said as she took some cake "Helping myself, you might say. It's about time I helped myself, don't you think?"

Bing said "I think she wants to fight." Beep said "Shh!"

"I thought a lot
about how we left things and it makes me sad."
"Oh, it makes me sad, too. We...we miss you, Cassandra. All of us want us to be friends again."

Cassandra said "Yeah,
we both have things the other wants, which brings me
to why I'm here. I want you to
give me the artifacts."

Evil walked over and said in a singsongy voice "I wouldn't do that. The artifacts are the only things that can only be wielded by the purest of heart.

Cassandra said "Stay out of this, Sackboy. Dream can think
for herself, hmm? Give me the elements
and I'll leave equestria and Atlantis and your new kingdom in peace."

Dreamworks said "Cassandra,
I don't think..."

"Oh, I know." Said Cassandra  "It's hard making decisions when the only friends
and advisors you have left are wash-ups, ordinary objects and losers.

Blantados shouted "Hey, we are not wash-ups!"

Travis said "Technically, we have never been washed-up of anything."

Burgertron said "And we're not ordinary objects!"

Frostferatu said "Technically we're more than meets the eye." They high fived.

Cassandra said "I'll give you
some time to decide. Enjoy your party, princess."

She threw the cake as Burgertron caught the plate and Kikmee caught the cake (well basically ate it)

Then as Cassandra left the rocks began breaking the castle making everyone leave. "Everyone to the nearest exits!"

As everyone was running posiden noticed Dreamworks was falling behind. Then posiden did the most difficult thing he had to do. He used his magic to teleport Dreamworks out of the castle.

Dreamworks fell on the ground with a grunt. She looked around in shock "No. No no no no no!" She ran to the top and saw that the castle was broken. Dreamworks watched with tears in her eyes. She cried as she laid down.

She heard a paper she looked up and saw a map of mystical items she got up and said with a determined face "I will get my kingdom and my friends and family back. Just you wait Cassandra. Just you wait."

She then left to start her journey to save her kingdom.