Disclaimer: I do not own Assassin's Creed, Frozen or Rise of The Guardians.

Important Please Read:

So this is a Jelsa/Assassin's Creed crossover. You do not necessarily have to play the games in order to understand everything that is going on but it may be useful if you haven't to do a Google search or ask me if you don't understand everything. Anyway, been wanting to do this story for a while now and now that I'm also playing Assassin's Creed Unity at the moment, it sort of has given me the inspiration to do it. So I've tried to do this story closely to the games as possible. The way the story will go will be it will shift from the present to the past but mostly be in the past. In modern times, we have Lizzie who is an American who has been experiencing Animus projects in Abstergo who is the descendent of Elsa, an Assassin from Arendelle (all of that is explained in this chapter) during the 1840's. Also points of views will include Anna, Jack, maybe Hans and others.

There will be no powers in this story as well as Elsa and her family is not the royal family of Arendelle. I had considered doing that but I felt like it was a bit odd for the Queen of Arendelle to be running around as an Assassin.

So a brief background information about the games for those who haven't played the games:

So there are two groups; Assassins and Templars who are fighting against each other. The Assassin's are the good guys whereas the Templars want to use First Civilisation (the people who came before and some are named after Roman Gods like Juno, Jupiter and Minerva) technology (they were really advanced) which is something that the Assassins want to put a stop to. Some of these technologies include Pieces of Eden which will be mentioned in this story. Abstergo is a modern day company that is using what is called Animus technology in order for people to experience their ancestor's lives as there is what is called Precursor DNA which allows this as all ancestor's memories are encoded in that DNA. People can go into the Animus and experience their ancestor's memories. I hope that clears up some stuff. That is really all I can think of at the moment, if lost any point, feel free to ask.

Couples: Jelsa, Kristanna, a bit of Hansanna (don't worry about that), Tooth/Bunnymund, Rapunzel/Eugene and maybe more.

Chapter 1: The Templar In The Ballroom

Present Day

"Why hello there," came the voice of a woman who slowly appeared on her screen. She was wearing a black leather jacket over top some long trousers. She had black hair which was tied back in a ponytail. "My name is Bishop, not my real name of course, and I would like to show you some stuff."

Lizzie was confused. She had just been recently been experiencing Abstergo's Animus projects when suddenly this woman, Bishop, suddenly came onto her screen.

"Listen," Bishop continued, "as you may be aware, I am an Assassin working to protect the world from the Templar Organisation which has a front in Abstergo. We need you to help us and choose to be an Assassin over becoming a Templar. To convince you of our cause, I'm uploading some sequences to show you."

Suddenly the scene in front of her changed very quickly.

Arendelle, Norway 1840

Elsa was in her house, Arendelle Mansion where Elsa's family had been living for generations, since the time that Arendelle was starting up. Elsa's family was the most prominent family in Arendelle especially since her family was one of the founding families. She was standing in front of a sea of people in a crowded ballroom. She was wearing a flowing blue ball gown that had different shades of blue material decorated with snowflakes. Her hair was done up in a bun which was different from her usual French Braid. She was watching her guests dance before her. She could see her sister, Anna, dancing with some Duke from a foreign country; she was thinking it may be Weselton or something like that. The Duke wasn't dancing really well and Elsa could see Anna gasping in pain as the Duke trod on her feet. Elsa was laughing silently to herself. Anna was giving her glaring looks whenever she could which just made Elsa laugh even harder. The Duke's dancing was really comical.

The dance soon ended and the dancers applauded their partners and the orchestra. Anna thanked the Duke and walked over to where Elsa was standing who was still giggling a little bit. Anna looked relieved that the dance was over.

"So, he was a bit sprightly," Elsa said.

"Especially for a man in heels," Anna said rubbing her foot with a wincing expression on her face.

Both sisters giggled for a little bit. Elsa noticed Kai, one of the main servants who worked in her house, coming towards her. She kept conversation going with Anna while keeping one eye on Kai who was rapidly approaching her. Kai bowed when he approached Elsa and Elsa nodded her head to acknowledge him.

"Milady," Kai said handing her a piece of parchment which had a symbol of an A with without the dash in the middle on it with the ends curved sharply, "this is for you."

"Thank you Kai," Elsa said taking the note from him.

Elsa opened the note. The word 'urgent' was the only thing on the note. Elsa got a little worried when she saw that. She folded the note and drew her fingers across the crease. Elsa wondered what could be required of her. Anna must have noticed the look on her face because she looked quite concerned herself.

"What is it Elsa?" she asked.

Elsa forced a smile. "Nothing."

"What was in the note?" Anna asked. Trust Anna, to pry into Elsa's business. Anna had always been like that, it was just a younger sister thing Elsa thought. Anna always liked to snoop, it was just her thing. She was quite curious about Elsa. Although, if Anna didn't snoop on Elsa, Elsa would think that something was wrong with her. Elsa had to go to lengths to stop Anna from discovering her secrets.

"Oh nothing," Elsa said lightly. "Just business. Now excuse, me, I've got to go to attend to this."

Elsa left Anna alone. Elsa caught a glimpse of Anna's face. It looked saddened and heart broken. Elsa felt a little guilty. She often had to leave Anna out of her business unfortunately. It had been like this since she was a little girl. It wasn't anything personal; it was just the way things needed to be. Elsa headed towards the library which was on the other side of the house. She walked past other guests who tried to engage her in conversation. Elsa feigned emergencies in the kitchen that needed her attention. The guests looked disappointed but accepted her excuse. Elsa hurried to the library and headed towards a certain bookcase and a certain book. Elsa looked around and saw a servant walking past. Elsa leaned up against the bookcase so that the servant wouldn't see her. The servant halted at the entrance to the library which was two magnificent mahogany doors which was left open by Elsa in her hurriedness to answer the door. Elsa thought that maybe he saw her but it turned out he didn't. He just let out a loud sneeze before continuing.

Elsa sighed with relief. Her hand found a certain book and pulled it out. The bookcase next to it slid away revealing a secret entrance. A set of stairs leading downwards could be seen. The stairs travelled down deeper and deeper into the Earth. Elsa walked down the stairs, her hand pulling down a lever so that the entranceway would be concealed again. The set of stairs, which was lined with torches, led into a magnificent stoned passageway with red carpet on the floor with gold trimming. Elsa followed this until it came to an area which had several different ways that she could go. She continued the way she was going or go right or left which led in different directions. There were also grand staircases that led upwards. Elsa followed the staircases upwards which led into a room very similar to a library. It had rows of bookcases, a desk with many different things on it and a golden globe. Sitting at the desk was none other than Master Assassin Anton Haugstad who was one of the main leaders of the Assassin Order based not only in Arendelle but in the entirety of Norway as well. He wasn't dressed in his Assassin outfit but rather normal clothes which showed he was a high class gentleman. Behind him, leaning against the bookcase with his arms folded and his feet crossed, was Elsa's mentor and friend Ragnar who was dressed in his Assassin outfit. His outfit was the usual Assassin hood (which was black) and a grey Assassin jacket. The jacket was over the top of a dark green vest. He wore dark brown gloves which had hidden blades attached to them. He had dark grey trousers on which ended in heavy leather boots. He had a sword strapped to one side and a pistol strapped to the other. His hood was down which revealed his kind but worn face. He nodded when Elsa walked into the room.

Elsa was a member of the Assassin Order and had been for a few years, since she was just eighteen. Her father, Agdar, had been a Master Assassin and one of leaders in Norway until his death three years ago. Elsa had been trained and groomed to become an Assassin since she was a young girl and she showed potential to become a great Asassin. The story (which Elsa had been told by her parents) goes that Elsa once picked up a sword and used it quite well due to someone who had never wielded one before. Her father, who had been more than impressed at this feat, told her that she showed natural ability which was something that couldn't be taught. It was soon revealed that when Elsa began her training, that wasn't all that she was good at. She was quite good at sneaking around and not being seen or heard which was essential for someone who was training to become an Assassin. However, there was one more reason why Elsa was trained. She had the sight (that was what they called it) or Eagle Vison (which was the common name for it) as some Assassins called it which had come in useful during her training at times. She could sense things that she couldn't normally see with the naked eye and be shown the path that she needed to take.

Her sister, Anna, on the other hand, wasn't inducted into the order. This was because of several reasons. Anna showed little interest in what Elsa and their father was up to. Agdar had tried to train her as an Assassin too but she couldn't do anything like the things that Elsa could do. Anna just didn't have the ability like Elsa in order to become an Assassin and she didn't possess Eagle's Vison like how Elsa (and some of her ancestors) did. But then again, that wasn't a requirement of becoming an Assassin.

Eventually, after Elsa's mother, Idun's, insistence, Agdar stopped the training but he continued with Elsa. He had been a bit disappointed that Anna hadn't become an Assassin but nevertheless he tripled Elsa's training in order to make her become an incredible Assassin which she did. Elsa's mother, however, wasn't an Assassin herself but she knew about the order and was sympatric with what it was trying to do. Idun's family had not only had been quite connected which had been useful in discovering Templars but some of them had actually been Assassin's themselves.

"Gentlemen," Elsa said to the pair of them, "you called?"

"Indeed we did," Anton got up from behind his desk and approached Elsa with his hands clasped behind his back. "I'm afraid we have trouble."

"What kind of trouble?" Elsa looked concerned with her brow furrowing.

"There seems to be a Templar amongst your guests," Anton said. He looked extremely worried when he said this.

"Who?" Elsa's mind was racing. She knew every one of her guests extremely well, how could anyone of them be a Templar? But then again, guests bring along friends or spouses or family members that Elsa wasn't as well acquainted with. Perhaps it was one of them who was the Templar? But how could a Templar come marching into Elsa's house right under her nose?

"We do not know," Anton said sadly. "All we know is that he or she is one of your guests tonight."

Elsa's fingers twisted themselves into fists as her hands clenched.

"Is this Templar somehow connected to The Architect?" Elsa asked. The Architect was a Templar that Elsa had been chasing after for the last year. He had something that Elsa wanted very much and something that was dangerous in the hands of a Templar. Her own father had been chasing after him as well but that was years ago when he died (which was when Elsa was eighteen and that was three years ago). He had died on a mission that had gone wrong when the guy – who he was supposed to be protecting – had turned on him and ratted him out. Elsa had recently found out that the guy who ratted him was an agent of The Architect. That only fuelled Elsa's desire to get that bastard.

"We do not know – yet," Anton added.

"What's my mission?" Elsa asked.

"Find this Templar," Anton said, "and bring him or her peace."

Elsa gave a short bow and headed out of the room. She knew what she had to do.

Anna watched as Elsa walked away. This often happened and when it did, it filled Anna with sadness which never seemed to go away. Elsa would get some kind of note or someone would whisper in her ear and she would walk off without another word. The excuse would always be that it was work, it was always work. Anna's family's work, well Anna never really knew what the business was about. It was always about one thing or another. Anna was sure that shipping was somehow involved. Elsa always seemed to be busy one way or another with work. She never seemed to stop. Although, Anna didn't know how that would explain Elsa's night time activities. Sometimes Anna would find Elsa sneaking out of the house late at night. She didn't know what Elsa was up to and Elsa would always say there was some emergency at work. But Anna didn't know if she bought that since it was late at night. How many night time emergencies could there be? Anna, however, had decided to let it go. Whatever Elsa was up to was her business. It wasn't as if Anna hadn't tried to find out what really was going on but she would always come up at a dead end. Once she tried following Elsa but she had lost her pretty quickly. After that, Anna gave up. Elsa was probably off seeing some guy or something else that was boring.

Anna sighed. Minutes soon past and Anna found herself still standing alone at the front of the ballroom. Elsa had been gone for a while. Anna thought that she would be back soon but it didn't look like that was going to happen anytime soon. Anna headed back onto the dance floor. She was looking for someone that she knew so she had someone to talk to. Maybe like Rapunzel and her husband Eugene who were both old friends of Elsa. Suddenly Anna felt some push into her and Anna felt herself tumbling over. Then a hand stretched out and grabbed her own hand. Anna looked up and saw a familiar face grinning down at her from above.

"Glad I caught you," he said.

"Hans," Anna said in a grateful manner.

She knew Hans from several other parties and balls that their family had hosted over the years. Hans had always been smiles and a kind face to talk to. Hans belonged to the Westergaard family, a high prominent family that lived in The Southern Isles which wasn't far from Arendelle. Hans and Anna had become quite close. Anna had to find someone that she connected with as Elsa was always busy with something. Hans had been that someone for her. It had been a relief.

Hans helped her up back on her feet. Hans offered her his hand for the next dance which happened to be a waltz. They danced and they danced around the room until the music ended. Afterwards, they wandered around the garden just talking and laughing. They ended the night sitting on the balcony outside Anna's room eating some food that they stole from the buffet table inside.

Elsa headed up to her room. She headed up to her bookcase and drew it towards her. The bookcase opened revealing a hidden room behind it. Inside was her Assassin combat outfit that was propped up on a stand. She couldn't change into her gear; there was a party in her house filled of people and she had to blend in so staying in her ball gown may be beneficial. Instead she just grabbed her hidden blade and she strapped it to her right hand. Luckily her ball gown was long enough that covered it and her cyan coloured glove covered her blade as well. Elsa tested the blade out and it seemed to be working fine. A grin formed on her face. She was excited. This was going to be child's play for her.

Elsa headed back down into the ballroom. She quickly got ambushed by Rapunzel and Eugene who both wanted the latest update on Elsa. She eased into the conversation with them while keeping an eye out for anyone acting suspiciously. She asked after Anna and Rapunzel said that she saw Anna go off with Hans Westergaard. Elsa was not too pleased when she heard this piece of information. Hans Westergaard was someone that Elsa didn't want to hang around her sister. Hans may be all smiles but that was all a front. Underneath those fake smiles were a self-centred man who only did what was in the best interest of himself. He wouldn't life a finger to help someone if it wasn't in his interest. Elsa also knew that Hans wasn't a nice man. He could get really nasty. She has seen it. Elsa let a scowl come over her face. Rapunzel saw this and smiled. She knew what Elsa was thinking.

"Come on," Rapunzel said. "Hans is a nice guy."

Elsa gave Rapunzel a look who looked like she suddenly agreed with Elsa. Elsa then noticed something out of the corner of her eye. While she had been talking to her friend and her friend's husband, a man dressed in a smart black, blue and silver suit was walking through the crowed ball room. He seemed to be moving in the direction that wasn't normal for someone who was just moving through the crowd looking for someone to talk to or to find a dancing partner. He seemed to be moving with a purpose and he was moving what looked like out of the ball room. Elsa had a funny feeling in her stomach. She excused herself from her friends who looked slightly confused by Elsa's abrupt exit.

Elsa followed the guy for a while. She stopped when the guy suddenly stopped as well. He had called someone over who had been talking to someone in the hallway. He had just walked off to say hello to his friend. False alarm, Elsa thought. Elsa should have known that someone who was dressed as snazzy as that guy wouldn't be someone trying to blend in and not be seen. Elsa took her eyes off him and continued to look around the ballroom. Someone in here was an enemy to her. The thought that crossed her mind was that Hans could be the one she was looking for. But just because Elsa didn't like him, doesn't mean that Elsa should condemn him. Besides, she hadn't been ordered to look into Hans as much as she wanted to, she couldn't.

Elsa headed out of the ballroom and up into upper galleys. These overlooked the ballroom and gave Elsa a vantage point. There were people up here too. All of them wanted some conversation with their host and Elsa was happy to supply it. She still kept an eye out though. Where was this guy? Why was he or she so elusive? Usually she was pretty good at this. She usually could spot the guy in moments. But this was a patience game. It was just going to take some time. Elsa then suddenly had a thought. What if she couldn't find the guy in the ballroom because he wasn't in the ballroom? If the guy knew that this house housed Assassins then maybe the Templar was sneaking through the safes in the house and there were a lot of them and some had some important documents in it which Elsa didn't want falling into Templar hands.

Elsa turned away from the upper galleries and headed further into her house. She wanted to make sure that no one was where they weren't supposed to be. Some servants were running around trying to get everything done. Elsa continued walking, just looking around. Her mind kept repeating what Anton said. Someone at her party, one of her guests, was someone that she needed to assassinate. Someone who she knew. The fact didn't ease Elsa's sinking feeling that she had earlier. Elsa passed the door to her study and then she stopped. Her head turned. The door to her study was ajar and she could hear someone rifling through drawers and papers. Elsa snuck forwards and pushed the door open slightly. She could see someone that she didn't recognise. He was dressed in fancy clothes and looked like he was one of the guests. She noticed that the painting of Arendelle behind her desk was swung wide open and the safe behind it was also open and the contents were all over her desk.

It was time to confront the thief. He was probably who she was looking for. Elsa opened the door and slammed it shut quite loudly. The thief looked sharply up at Elsa. He looked suddenly afraid of being discovered.

"Who are you?" she asked. She knew that she should just get the thief but she was curious about him. The thief didn't respond. He instead lunged at her with a knife. Elsa expecting him to do something like that so she was ready for it. She grabbed his wrist while simultaneously dodging the blade.

"Never killed someone before have you?" Elsa asked.

The thief looked at her with terror in his eyes. Elsa then with her other hand she extended out her hidden blade and stabbed him right in the chest with it. The thief's eyes got wide and he looked down at the blade that was in his chest. Elsa pulled it out and the thief collapsed on the floor right then and there. Someone then came into the room behind her. It was a couple of servants who doubled as Assassins. They worked with Elsa's family as kind of like protectors.

"Someone had an accident," Elsa said to them. "Mind cleaning it up?"

The two servant-assassins quickly obliged and managed to get rid of the body. Identifying him would be the next step. Anton may be able to help with that or maybe even Ragnar could. He was often good and getting information from any source. Elsa quickly went through everything that the thief was looking through. Elsa discovered that there was nothing in these files that related to the Assassins. Just information about the businesses that Elsa ran after her father's death which she did with the help of her father's family (some were also Assassins and some weren't). What could the thief want with these documents? Elsa was confused. Did he mean to look through these or had he been mistaken in the room he had selected?

Anna was walking with Hans towards the main gates of the Arendelle Mansion. They were just talking about all kinds of different stuff. The lights from the house were twinkling in the background while servants lined the paths carrying lit lamps to guide their way. A carriage arrived, ready to take Hans back to the house that he and his family liked to stay at while they were in Arendelle.

"Thank you for coming tonight," Anna said to Hans.

"My pleasure," Hans replied. "I certaintly hope that this isn't the last I see of you Miss Winters."

"I'm sure it won't be," Anna giggled slightly at the compliment that Hans had paid her. He was always good with those.

"Excellent," Hans said in a sweet voice. He then kissed her hand tenderly. "Well then goodnight then."

Hans got into the carriage and Anna waved goodbye to him.

Kristoff was in the stables at the Arendelle Mansion. He was tending to his reindeer, Sven, who was in one of the stables. Kristoff was the local ice harvester in Arendelle and the Winters family, who lived at Arendelle Mansion, allowed Kristoff to keep his sled and his reindeer in their stables as Kristoff didn't really have a place to keep them. They also allowed him to live in a house that was off to one side from the mansion as well. Kristoff was very thankful to the Winters family. His parents, who had died when Kristoff had been a child, had worked for them and even though Kristoff was adopted by another family, one who he really liked, he was always welcomed at the Arendelle Mansion. At the moment, Kristoff was feeding Sven carrots. He was really happy to know that he was allowed to keep his best friend around. Kristoff didn't really interact with a lot of people and Sven understood him completely.

"Kristoff?" came the voice of someone he knew.

"In here," Kristoff called back.

His friend, who he had known since they were children, came into the room. It was Anna Winters, the youngest daughter and child of the Winters' family. She was looking particularly beautiful tonight and Kristoff couldn't help but stare. It was pretty obvious to everyone, especially Sven, that Kristoff had fallen heads over heels in love with her. Anna was the kindest, most wonderful person that he had ever met. Of course, Anna was completely oblivious to how Kristoff felt about her. Kristoff knew that she was falling hard for Hans Westergaard someone who Kristoff didn't like very much at all. It wasn't just because he was a creep who always looked down on people like Kristoff, someone who had to make their way in life, but it was also because he was jealous. Hans could have what he couldn't. Anna, who was in the guardianship of her older sister and has been since her parents died, wouldn't want Anna running off with someone like him. She would prefer if Anna married someone like Hans; someone rich and important who could provide for her.

"So how was tonight?" Kristoff asked as he turned away from Sven.

"Oh tonight was wonderful," Anna said. "I just love balls and parties. I wish we could have them all the time but Elsa says no." Anna looked a little upset about this for a second but then that happy look that she always wore that Kristoff loved came back over her. "Anyway, I just love to dance and I danced so many dances. I think I danced like a hundred times tonight. Oh it was so wonderful except Elsa passed me off to dance with that man the Duke of Weselton. I hate that guy."

"Weaselton?" Kristoff asked.

"It's apparently Weselton," Anna rolled her eyes. "The guy can't dance but he thinks he is the best thing since sliced bread."

"So was that the highlight of this evening?" Kristoff asked with a bit of a laugh.

"Oh no," Anna then got that dreamy look on her face. She wore it whenever she was talking about Hans. Kristoff now knew where their conversation was heading. "Hans was. He is just so wonderful and dreamy. Tonight I thought he was going to propose but alas – he didn't. He is probably being a gentleman and waiting to ask for Elsa's permission before. After all, she's the next best thing after asking our father."

"So he didn't ask Elsa's permission?" Kristoff asked.

"No," Anna shook her head. "She was busy tonight with work which is why Hans didn't ask. But imagine if he did and I would be Mrs. Hans Westergaard." Anna said this in a dream like manner which made Kristoff's stomach start to fill with jealously.

"How great," Kristoff said. "Maybe the next time. He may be coming around tomorrow to ask Elsa for permission."

"Maybe," Anna almost squealed the word. "Well as much I would love to stay and talk to you, it's getting kind of late and I have to be in bed before Elsa has a meltdown to why I'm not in my bed." Anna looked slightly irritated when she said this and she rolled her eyes as well.

"Goodnight," Kristoff said waving at her as she walked off.

"Goodnight Reindeer King," she said waving back.

Kristoff sighed. He only wished that she would talk about him the way she would talk about Hans. Sven gave him a look.

"She's out of my league Sven," Kristoff said. Sven then gave Kristoff a look. "Oh don't give me that look. She's in love with Hans, not me. I don't want to break her heart."

Sven didn't look convinced. Kristoff gave Sven a look before he left the stables to go to bed as well.

A/N: So this has been the first chapter. I hope everyone enjoyed it. What do you guys all think? Continue? Or not to continue? Quick note; I know I said that the rewrite to my Asylum story but that's been put on hold for a little bit as I want to write this story. Please review =)