Some years ago...

...

It was late one night as the northern lights danced in the night sky, surrounding the village of Arendelle. As night fell, the northern lights began to illuminate the night sky, lighting it up in shades of purple and pink light.

And inside the Arendelle castle, a different kind of magic was happening...

...

"Anna! Elsa!" King Agnarr called out.

"Bed time soon!" Queen Iduna, the girls' mother, had said.

Meanwhile, inside their bedroom, Anna and Elsa were playing around a small mound of snow. The snow had been shaped into rows of trees and rocks, creating a tiny forest. Around the tiny snow trees were small figurines, all made from snow. They were shaped like animals, toys, and people.

"Oh no! The princess is trapped by the goblin's evil spell!" little Anna cried out as she was playing around with snow figurines of a princess and a goblin. "Quick Elsa! Make a prince! A fancy one!" Elsa nodded and, using her ice powers, quickly created a figurine of a prince. She then handed the figurine to Anna.

"Oh no! The prince is trapped too!" Anna exclaimed as she held the two figurines, waving them around. "Who cares about danger when there is love?" she then asked in a deep voice, imitating the prince. Then, she brought the figurines together and started making loud smooching noises as she made the figurines kiss. "Ugh, Anna! Blech!" Elsa exclaimed, wrinkling her face in disgust. "Kissing won't save the forest."

The girls kept playing as their parents came into the room. "The lost fairies cry out!" Elsa said as he waved a snow elephant around, making a trumpeting noise. She then held up a snow giraffe. "What sound does a giraffe make?" Anna shook her head. "Never mind," Elsa said as she held up a snow horse, with a fairy riding it. "They wake the Fairy Queen, who breaks the spell and saves everyone!" She then threw it to the snow goblin, toppling it over. "And they all get married!" Anna said as she hugged the figurines.

At that moment, the girls' father, King Agnarr, noticed the two girls playing. "What are you playing?" he asked. "Enchanted forest," Elsa answered. "The prince and the princess whoosh!" Anna exclaimed as she was playing around with the prince and princess snow toys.

Agnarr then took a look at the mound of snow that looked like a forest and chuckled. "That's like no enchanted forest I've ever seen," he said.

At that moment, Elsa paused. "You've seen an enchanted forest?" she asked.

At that moment, Anna's head pricked up. "Wait, what?" she asked. Now she was curious.

"I have. Once," Agnarr said as he stood by the bed.

Anna put her hands to her hips. "And YOU never told us this before?" she questioned.

Agnarr chuckled. "Well, I can tell you now," he said. "Okay, tell us now," Anna and Elsa said as they leapt onto the bed, their eyes wide with curiosity.

Iduna, however, seemed unsure if her two daughters were ready to learn more about this "enchanted forest".

"Are you sure about this?" Iduna asked. "It's time they know," Agnarr assured her. It seemed clear that now was the right time to tell Anna and Elsa the story of the enchanted forest, so they could know.

"Let's make a big snowman later," Anna whispered to Elsa, who smiled.

"If they can settle and listen," Agnarr told Iduna. At that moment, Anna and Elsa both held their breath, ready to listen to the story.

Agnarr chuckled. Holding the candle, he began to tell the story.

...

"Far away," Agnarr began to say, "as north as we can go, stood a very old and very enchanted forest. But it's magic wasn't that of goblins, spells, and horse fairies. It is protected by the most powerful spirits of all. Those are Air, Fire, Water, and Earth.

"But it was also a home to the mysterious Northuldra people," Agnarr continued. By then, Anna's eyes widened with wonder.

"Are Northuldra magical, like me?" Elsa asked.

Agnarr shook his head. "No Elsa, they were not magical," he continued. "They just took advantage of the forest gifts. Their ways were so different from ours. But still, they promised us friendship. In honor of that, your grandfather, King Runeard, built them a mighty dam to strengthen their waters. It was a gift of peace."

"That's a big gift of peace," Anna said, awestruck.

"And I was so honored to get to go to the forest to celebrate it," Agnarr had said. "But I was not all prepared for what the day would bring."

Many years ago, the kingdom of Arendelle had gathered at the enchanted forest to give the Northuldra people a strong dam to fortify their waters and bring peace among them. A young Agnarr stood close by his father as they were escorted to the forest by the royal guard.

"Stand tall, Agnarr," King Runeard reminded his son. Agnarr then straightened himself, dusting off his jacket.

As the Northuldra converged, the leader had shaken hands with King Runeard, to ensure a lifelong pact of peace and harmony between them and the kingdom. Soon after, they two clans held a party to celebrate. The Arendelle royal guards watched with amazement as two Northuldra villagers rode on reindeer.

Throughout the party, they talked, laughed, played games, and enjoyed themselves.

"We let our guard down. We were charmed, and felt so magical," Agnarr continued.

Young Agnarr watched as the Arendelle guards were enjoying the festivities that were brought unto them by the spirits of the forest. The waves of the lake were dancing around two soldiers, while large stones converged to form a giant reindeer.

At that moment, Agnarr felt a cool breeze.

Walking away from the celebration, he peered behind a tree, and noticed a young girl with reddish-brown hair playing around by herself. She was floating, for the winds had magically picked her up and suspended her in the air for a short time. And she was laughing joyfully as the wind chirped.

Agnarr smiled as he watched the girl play.

"But something went wrong."

Suddenly, Agnarr heard shouting. Turning around, he noticed the clans attacking each other.

What was going on?

"They were attacking us," Agnarr continued.

One of the Arendelle guards, Matthias, stood in front of Agnarr, withdrawing his shield. "Get behind me," Matthias ordered. Agnarr could only watch in horror as the Arendelle guards were fighting against the Northuldra villagers.

"It was a brutal battle," Agnarr told the girls. "Your grandfather...was lost."

As Agnarr looked around, he noticed his father battling another villager. And they were precariously edging near a steep cliff!

"Father!" Agnarr shouted, running to save him. But by then, it was too late.

"The fighting enraged the spirits. They turned their magic against us."

Suddenly, bright purple flames began to erupt from the ground, surrounding the guards. The lake's calm and gentle waves suddenly grew monstrous as they chased the guards away as the powerful winds followed. Agnarr couldn't believe what was happening.

But he didn't have time to process what was going on, because a large boulder had crashed next to him, knocking him out.

"Then," Agnarr said, "there was this voice. Someone saved me."

Blacked out by the collision, Agnarr began to hear a mysterious voice. It sounded like someone was calling out to somebody. Then, he began to feel the winds gently raising him...

"Untold," Agnarr continued, "the spirit then vanished. And a powerful mist covered the forest, locking everyone out. And that night...I came home, king of Arendelle."

He then blew out the candlelight.

...

Anna was awestruck as the story ended. "Whoa," she said, amazed. "Papa, that was epic! Whoever saved you, I love them."

Agnarr sighed. "I wish I knew who it was," he said as Anna was playing around with the bed covers.

"What happened to the spirits?" Elsa asked curiously. "What's in the forest now?"

"I don't know," Agnarr told her. "The mist still stands. No one can get in, and no one has since come out." "So we're safe," Iduna added in. "Yes. But the forest could wake again. And we must be prepared for whatever danger it might bring," Agnarr told Elsa.

"So, on that note," Iduna said as Agnarr was leaving, "how about we say good night to your father?"

"Oh, but I still have so many questions!" Anna said. "Save them for another night," Iduna told her. "Aw, you know I don't have that kind of patience!" Anna had said. "Why did the Northuldra attack us anyways? Who attacks people who gave them gifts?"

"Do you think the forest will wake again?" Elsa asked. "Only Ahtohallan knows," Iduna had told her.

"Octo-who...What now?" Anna asked.

Iduna smiled.

"When I was little," she told her daughters, "my mother would sing a song about a special river, called Ahtohallan. That was said to hold the answers about the past." "Wow," Anna said aloud. "Will you sing it to us? Please?" Elsa asked.

Iduna smiled at the girls. "Okay," she said as she settled into the bed. "Cuddle close. Scooch in." As Anna and Elsa edged closer to their mother, Iduna caressed them both and began to sing:

"Where the north wind meets the sea,

There is a river full of memory

Sleep, my darling, safe and sound

For in this river,

All is found."

One by one, Anna and Elsa slowly began to drift off to sleep.

"In her waters," Iduna sang as she carried the girls to their beds,

"Deep and true

Lie the answers and path for you

Dive down deep into her sound

But not too far, or you'll be drowned

Yes, she will sing to those who hear

And in her song, all magic flows

But can you be brave what you most fear?

Can you face what the river knows?

Where the north wind meets the sea

There's a mother full of memory

Come, my darling, homeward bound

When all is lost

And all is found..."