Hiccup and the others had been travelling for quite some time until eventually they reached an oasis, which was home to a frozen spring. Unfortunately, the place was also filled with criminal type people so they were very cautious.

They soon made their way into a tavern and saw the bartender creating a drink flawlessly. First he grabbed some bowls made of ice, sliced a few mangoes off and they began chopping them to pieces. Then using his sword he put the bits into the bowl and then added some water.

"Seems like a nice place," said Snotlout.

"Let's get something to drink," said Ragnar.

They then made their way towards the bar, but the man who ordered the drink then accidentally ran into Ragnar dropping the contents of his bowl onto his shirt. The man immediately gave him an apologetic look.

"No need to worry, I can clean up easy," he said.

Ragnar then unleashed a burst of wind around him dispelling the contents on his shirt.

The man stared at him in wonder. "Your own living Airbender."

"So I've noticed," said Ragnar.

"An Air Nomad, right in front of me," he said rubbing his chin. "Professor Calder, Head of Anthropology in Meridian University." He then immediately grabbed his arm and studied his tattoos. "Tell me, which of the Air Temples do you help from?"

"None of them actually," said Ragnar regrettably. "I was born when we were roaming the land, running from the Empire. Though my mother originated from the Southern Air Temple."

"Splendid," he said as he began measuring his head. "Now tell me what was the primary agricultural product of your people?"

"We usually had berries," Ragnar blinked.

"Truly fascinating," said Calder. "That is one for the journal."

"It would seem as if you've got a new Ragnar," Hiccup smiled. He then looked at Calder. "I don't suppose you have a more current map Professor? Ours is currently out of date."

"Certainly," said Calder.

Once they all got a drink they immediately made their way to the nearest table and Calder rolled out a map.

"You certainly made a lot of trips into the desert," Heather noticed.

"All in vain am afraid," said Calder sadly. "I found lost civilisations all over the Earth Kingdom, but I haven't managed to find the crown jewel. Cloudjumper's Library."

Snotlout snorted. "You spend years walking through the desert, to find some guy's library?"

A small smile appeared on Calder's face. "This library is more valuable than gold, young man. It is said to contain a vast collection of knowledge, and knowledge is priceless."

"I've heard of this," said Hiccup looking at the map. "My mother one so that she found the library."

Calder's eyes widened. "You know where it is?"

Hiccup shook his head. "She never divulges that information, but she said that she learned a lot."

"Shame," said Calder looking disappointed, he then looked at the others you were giving him blank looks. "According to legend, the knowledge spirit, Cloudjumper, with the help of his Scatterclaw dragons." He then pulled out a piece of parchment with the image of a library on it. "Cloudjumper and his knowledge seekers collected books from all over the world and then put them on display for mankind to read, so that we might better ourselves."

Hiccup frowned. "The tales my mother told me, she said that many people came to library in order to find weapons and knowledge to defeat their enemies."

Astrid looked at him. "Can't we do the same?"

Hiccup looked at her with a concerned look. "I'm more concerned about the library's keep. There's only so much tolerance that the spirit may have."

Ragnar looked at the drawing. "It's worth the chance, he may listen to you being the Avatar."

Heather smiled. "Looks like we're going to find a library."

"If it was only that easy," said Calder. "I have made several trips into the Sandbuster Desert and almost died each time. I'm afraid that desert is impossible to cross."

"Unless you have a group of dragons with you," Hiccup smiled.

They soon made their way outside and discovered that the dragons were being harassed by several men in clothes.

Calder immediately rushed towards them. "Sandbenders, shoo! Away from the dragons!"

The Sandbeners then made their way to a strange contraption that looks liked a boat. Then they began to spin sand around the sale and immediately took off into the desert.

Soon they were flying into the air and began to study the landscape of the desert. The heat crashed down on them like a ton of bricks, in fact the only ones who want affected by the heat were Hiccup and Astrid, no doubt because they came from warmer climate.

Calder was riding with Ragnar on Skull, but he was immensely intrigued with Toothless. Not surprising considering that he was probably the last of the Night Furies.

"I never thought I'd see a Night Fury," he gasped and looked at Hiccup. "Aren't they the symbol of the Royal family… uh, the old Royal family."

Hiccup nodded. "Yeah, only a handful of people in my lineage have been able to ride one. They are considered to be the most intelligent of dragons, not to mention the fastest and the stealthiest."

"Amazing," Calder gasped.

"Look at the architecture of this place," said Fishlegs looking at the drawing of the library.

The twins flew down next to him and looked at the picture.

"Shouldn't be too hard to find a place like this," said Tuffnut.

"Yeah, we should be backed by teatime," Ruffnut nodded.

However their prediction proved false as hours passed and they found no trace of the library.

"We've been searching for hours," Snotlout groaned.

"But once I actually agree with him," said Heather looking at the others. "I mean it shouldn't be this hard to find a giant building from the air."

Hiccup continue to look through his spyglass and then something caught his eye. "Down there! I see something!" he pointed.

They immediately flew down and landed at the base of some tall tower.

Astrid shook her head at the drawing Hiccup was showing. "This is definitely not the library, I mean the building this drawing is enormous."

They start when they saw a baby dragon appearing out of nowhere and in its mouth held a scroll.

"I've never seen that type of dragon before," said Ragnar.

They watched as the dragon flew up towards the tower and into one of the top windows.

"I think I was one of the knowledge seekers," said Calder excitedly. "Oh, we must be close to the library."

Ragnar looked at the drawing Hiccup was holding. "No, this is the library. Look!" And they looked at the tower him back onto the drawing and found that there was a tall tower in the very centre of the library. "It's completely buried."

"The library is buried!" Calder cried as he fell to his knees into the sand. "My life's ambition is now full of sand! He then immediately pulled out a shuttle. "Well, time to start excavating."

He then began digging into the sand, though everyone knew it would take him many lifetimes did the entire library out of the desert.

Snotlout immediately placed his hand onto the tower. "You don't have to dig Professor. The insight seems to be completely intact and its huge."

"That dragon went through one of the windows, I say we climb up there and give it a look," Astrid suggested.

Hiccup nodded in agreement. "Snotlout you and the twins doubt it would the dragons. No point in all this going in there."

"Fine by me," said Snotlout as he fell to the June and placed his hands behind his head. "I prefer snoozing to reading any day."

Astrid tied a rope to her axe and immediately tossed it towards the window and then gestured to the boys.

"You boys go first," she said.

"Why?" Fishlegs asked. Hiccup notched him and then gestured to their skirts. "Ohh!"

Calder was the first to climb you are quite eager about it, followed by Hiccup, next came Ragnar then Fishlegs and finally Astrid and Heather climbed.

It took some doing but eventually managed to get inside of the tower and began to shimmy down the rope. Unfortunately, due to the change of positions the girls immediately grabbed their skirts.

"We really didn't think this through did with?" said Astrid looking up at Heather.

"No we certainly did not," Heather nodded.

"Don't worry, we're not looking," said Hiccup as he and the others turned away.

Thankfully they had ample reason to look away, because the library was an architectural marvel. There were shelves beyond shelves filled with books.

"Oh, it's so breathtaking," said Calder in wonder. "The spirits spend no expense in designing this place."

They then immediately landed on a platform that spanned through to many shelves in the library. No sooner have they landed that they heard a sound deep within the library and immediately hit behind the pillars at one of the entrances. Then emerging from the entrance on the opposite end of the library was a dragon with ball wings and it had resembled that of an owl.

"I know you're back there," he said looking towards them.

Hiccup looked at the others and shrugged and one by one they emerged from their hiding place.

Calder was the first to approach the spirit. "Hello, I'm Professor Calder, Head of Anthropology in Meridian University."

Cloudjumper looked at him curiously. "A professor, it's where we get someone like you."

Hiccup then stepped forward. "I take it that you are Cloudjumper."

"Indeed I am," said Cloudjumper. "And I should warn you that I'm very mistrusting with humans."

"Because many people that come here have abuse the knowledge you have collected," Hiccup assumed.

Cloudjumper nodded. "Indeed, many of the humans I deal with are trying to get the upper hand of an enemy they wish to destroy. Like that Firebender that discovered this place a few years ago, looking to destroy his enemies."

Ragnar looked up. "Their names will happen to be Viggo and Ryker Grimborn by any chance?"

Cloudjumper looked at them curiously. "Ah, I see that you've heard of them. My interest is piqued, what became of them?"

"They invaded the North Pole and attempted to conquer the Water Tribe," Hiccup explained. "With the knowledge they found in this library they were able to discover the identities of both the Moon and Ocean Spirit. I believe that Viggo only wanted to contain the Moon Spirit long enough to conquer, the Water Tribe before releasing it. Ryker on the other hand killed the Moon Spirit when things did not go his way."

Cloudjumper looked immensely trouble upon hearing this. "A foolish thing to do, but I take it that the moon situation has been soul considering that it still shines in the sky."

Astrid nodded. "A brave young woman, who was saved by the Moon Spirit, gave her life to revive it. She and the Moon Spirit are now one."

"And what became of the two Firebenders?" Cloudjumper asked looking intrigued.

Ragnar then stepped forward. "I thought Viggo on the icy cliffs of the North Pole. The ground beneath his feet gave way and he fell into the icy waters, nowhere he could survive on his own. At for Ryker, eyewitnesses saw him being dragged to the spirit world by the Ocean Spirit, no doubt to pay for his crimes."

"Then you will face a fate worse than death," said Cloudjumper. "Now tell me why you have come here?"

Hiccup stepped forward. "I am the Avatar and my one main duty is to maintain the balance. Unfortunately that cannot happen until we stop Emperor Drago."

Cloudjumper sighed. "So, you were looking for an edge just like all humans."

Hiccup looked down the ground. "I know that will make our view of us any different your eyes."

Cloudjumper nodded. "What do you think I moved my library into the middle of a desert? Though I should tell you that I do have company and she is human."

Immediately everyone looked up at the sword armoured figure approaching them. Hiccup's eyes widened as she bore an exact resemblance to the vision he saw in the swamp.

"I saw her before," Hiccup gasped. "In the swamp."

The woman then approached them and they could feel that her eyes were watching them and then she immediately looked towards Hiccup. She then slowly began to approach him and then examined the scar under his chin and she backed away in shock.

"Hiccup? Can it be after all these years?" she gasped.

Hiccup blinked. "Should I know you?"

The woman immediately removed her helmet to reveal a 70-year-old woman with silver grey hair looking at them. Upon seeing her face Hiccup recognised it, though he couldn't quite put his finger on it.

"I have changed since the last time I saw you," she said with tears in her eyes. "You haven't aged a day."

Astrid then stepped forward. "Tell us who you are?"

The old woman took a deep breath and looked at them. "I am Valka Haddock." She then looked at Hiccup. "I'm your mother."

Hiccup gasped.

Snotlout and the twins were sitting outside unaware of what transpired in the library.

"Do you think they found anything yet?" Tuffnut asked looking at Snotlout.

Snotlout looked at him. "How should I know? I'm a lot more concerned than I will be able to do much bending here."

Ruffnut looked at him. "Why not?"

Snotlout sighed. "I'm more used to bending large boulders, not tiny grains of sand. I just hope that were not attacked by anything out there."

Meanwhile Cloudjumper and Valka were leading Hiccup and the others deeper into the library. Hiccup was still amazed that he just been reunited with his mother, though she more looked like his grandmother now.

"You're right?" Astrid asked looking at him.

"I'm just a bit stunned," Hiccup admitted.

Astrid nodded to him in sympathy. "I suppose I would feel the same way. Though at least you guys are reunited."

Hiccup sighed. "Small consolation considering that within separated for 20 years."

Ragnar and Heather were now walking with Valka and she had a very solemn look about her face.

"So you're Hiccup's mother?" Ragnar asked.

Valka nodded. "Though I'm more like his grandmother now. When I heard that he returned, knew this day might come in yet I don't know how to feel."

Heather looked at her. "I lost my mother a long time ago, so trust me when I say that he is happy to see you. He just feels as if he's failed his duties as the Avatar, you now not stopping Drago's coup attempt."

Valka sighed. "Never of us saw that coming. He first had his Navy vessels attack Hiccup and believe that he killed him. He then use that to motivate people saying that our bloodline was weak and then he attacked us at the very heart of the capital, in the Palace itself."

"How did you get away?" Heather asked.

"Stoick battled against Drago and some of his top lieutenants to buy me time to escape," Valka explained. "He fought with all his heart, but in the end he was outnumbered. However that did not stop them from leaving wounds on Drago. He did massive damage to his arm, burnt it completely and he is now forced to wear armour around it."

Calder was looking around the library with wonder. "So many books, so much knowledge."

Cloudjumper nodded. "I have spent aeons collecting all this knowledge, but most of the humans that visit here abuse it for the own selfish gains. It is very tiring and at one point I was considering to banish this library out of this realm."

"Such a waste," said Fishlegs.

"You're not much better," Cloudjumper pointed out.

"But you haven't tossed it out yet so are you helping us?" Astrid asked.

"Let's just say that I have my own reasons for defeating the Fire Empire," said Cloudjumper.

Then suddenly they came to a stop when they found shelves of books burnt down to a crisp.

"Firebenders," Hiccup stared.

"The Empire destroyed everything about their nation," said Heather looking appalled.

Cloudjumper nodded. "All that knowledge that I have accumulated over the eons destroyed in a single moment. Emperor Drago has for the balance of your world and in turn it will affect the spirit realm."

"So you'll help us?" Ragnar asked looking up at him.

"Only because I know that you use this knowledge, not to destroy your enemy, but rather to save them from themselves," Cloudjumper concluded. "However, this will be the last time. After you leave I will I shall return the library to the spirit realm and it shall not return to this realm until humans properly respect the spirit realm."

Calder then looked at the spirit. "Then can I ask this humble request, that I stay in this library with you?"

Cloudjumper looked at him. "Very well, though I warn you may never see your world again."

"I could spend an entire lifetime here," said Calder looking at all the books.

Hiccup then looked at Valka. "What about you, Mum."

"I'll be coming with you," said Valka. "I think I think looked up and this library long enough and I personally want to see Drago knocked off his throne."

Cloudjumper then led them to a strange door which resembled the sun.

Cloudjumper then looked down at Hiccup and Astrid. "I have no doubt the two of you have learned that one day the Empire faced its darkest day."

Hiccup nodded. "Yeah, but there was no written texts about what exactly happened."

Astrid nodded. "And the Empire doesn't even speak of it much anymore."

"Then you're about to discover what happened on that day," said Cloudjumper and slammed his foot into the ground.

Immediately the door began to open and they ended inside.

"Pull the lever," said Cloudjumper.

Hiccup made his way over towards the lever and pulled on it and immediately they found themselves in some sort of planetarium. The stars were shining above them and they saw mechanical brace that resemble the moon above them moving with the stars.

Calder eyes widened. "This room is a true marvel. A mechanical wonder. It planetarium that shows the heavens moving."

The stars soon vanished and they found themselves in daytime and soon they saw them the mechanical brace representing the sun rising into the air.

"This is beautiful and all, but how is it helpful?" Astrid asked looking at Cloudjumper.

"You'll see," he said.

Fishlegs then immediately approached the podium in the centre of the room. "I think each one of these dials represents date in time. He then looked at Hiccup, Hiccup you wouldn't happen to know the precise date of the Empire's darkest days?"

"I think so," said Hiccup and made his way to the dials.

Once he finished setting the date he pulled down on the lever and they watched as the planetarium rotated. Soon they reached day, but then everything turned black.

"What happened to the sun?" Astrid asked confused.

"Please tell me we didn't break it," said Fishlegs.

Hiccup looked up his eyes widened. "It's not broken, the sun is behind the moon. It's a solar eclipse."

Immediately they all looked up and indeed they saw that the moon was behind the sun.

Ragnar then understood what this meant. "It was literally the Empire's darkest day. We may not know what happened on that precise date, but we know what happened to the Empire. Firebenders lose their bending during a solar eclipse."

"That makes sense," Heather nodded. "Just think about what the lunar eclipse did to the Waterbenders."

Cloudjumper nodded. "If you act swiftly and quickly, you may take this brief moment as your opportunity to end the war."

Hiccup then looked at him. "I don't suppose you know when the next solar eclipse would be?"

Cloudjumper looked at him. "Indeed, I do."

Snotlout and the twins were still waiting for Hiccup and the others to return. However then they saw something heading straight towards them in the distance.

"What's that?" Tuffnut asked.

"Looks like a dust cloud," said Ruffnut.

Snotlout eyes widened as he saw that heading towards them were Sandbenders riding their sails towards them.

"Sandbenders," Snotlout gasped.

Immediately one of the Sandbeners fired a burst of sand that surrounded the dragons. Once they were close they began to surround them in a circle motion and one by one Sandbenders jumped off their sails.

The twins immediately grabbed their spears and immediately charged at the Sandbeners, but they were instantly blown away by their sandblast. Snotlout tried to strike back, but he could barely bend the sand.

He tried by a sandblast and a bunch of Sandbenders, but they combine their powers and immediately overwhelmed and he soon found himself trapped in a dune. Once Snotlout and the twins were taken out of commission they then began tossing chains around the dragons. Despite their best attempts to melt the chains, it was clear that they were made from dragon proof metal make it impossible for them to melt.

"Put a muzzle on him," said one of the Sandbenders.

Immediately the Sandbenders began to put muscles on the dragons.

Snotlout was barely conscious and saw them dragging the dragons away. "I'm sorry, guys," he said weakly.

Once Cloudjumper gave them the precise date of the next solar eclipse, thankfully would only happen in a few months time before Haddock's Comet arrived, they made their way back to where they entered.

"Thank you for everything," said Hiccup bowing respectfully to Cloudjumper.

Cloudjumper did the same. "I just hope the knowledge that you provide is of use, because no one will be entering this library can. Not until they learn not to abuse the knowledge at the very least."

Calder smiled at them. "Goodbye."

They then began to climb the rope one by one, and the moment they got outside the entire library sank beneath the sand.

"Looks like that's it for the secret library," said Astrid.

"I'm sure it will return one day," said Valka.

That's when they noticed that Snotlout was trapped in a dune and the twins had been knocked out cold and most distressing their dragons were gone as well.

Snotlout regained consciousness and saw them. "I see you guys made it out."

Hiccup looked at him. "Where are the dragons?"

Snotlout immediately looked away and Hiccup's eyes widened.