Disclaimer: I don't own Golden Sun or Sailor Moon… -_-;

This chapter is focused a little more on Isaac, the main character of GS. But the later chapters will focus on Usagi.

I finally got the motivation to actually bother writing a crossover, I don't think I've ever seen a GS/SM crossie before, and I was determined to make it work! ^^ Hope you enjoy reading it!!
PS. Golden Sun is so awesome! You just gotta get the game!! (The sequel is just as good, but there wasn't enough Isaac in it…hehe) And for all those who've never seen it before, this story starts from the very beginning with all the bits and pieces! ^^ Only Usagi has been shoved into their world.

Ohh, here's GS dictionary for those who've never played Golden Sun nor know anything about it-
Psynergy – Kinda like magic. Ya know … really useful, can move things, etc. It can only be seen by Adepts. You'll get it once we get moving with the story.
Adepts – People who use Psynergy. (You know, like Wizards use magic…)
Machete – A small blade (yes, it's a weapon)
Vale – Isaac, Garet, Usagi and Jenna's hometown.
Psynergy stone – A purple stone that replenishes Psynergy.

~*~*~*~*~*~
Unnatural Adept
Prologue
~*~*~*~*~*~

"Isaac, wake up!" A loud voice tore through Isaac's dream, "Please, dear, wake up!" Isaac felt someone's hand trying to tug the blankets off him.

Isaac wearily cracked his blue eyes open and looked into the pale face of his mother, Dora. "Mt. Aleph's boulder is going to fall!" she cried at him frantically.

Outside the protective warmth of the house, lightning flashed as thunder rolled. Isaac blinked, it felt as if his whole house just jerked.

"Come on Isaac. We have to go – now!" His mother ordered. Isaac sat up immediately, and jumped out of bed.

"Isaac, you forgot something!" Isaac's mother used her Psynergy –catch- to obtain his machete. "It's pouring outside! Don't go without your tunic!" she chided him. Handing him his machete they started to walk towards the stairs. "Have you got everything you need?" she asked, turning around to look at him before they descended the flight of stairs.

"Yeah," he answered with a nod.

"Good for you, Isaac. A lost possession can be replaced; a lost life can't." Isaac could only nod at what his mother told him as they both hurried down the stairs.

"Isaac, Dora, hurry! The boulder could fall at any second!" Both Isaac and his mother turned towards the source of the voice. Isaac's father Kyle stood in between the frames of the front door, urging them to hurry. Dora and Isaac looked at each other for a split second. A loud banging noise was heard, and both occupants of the room jumped in surprise.

"Come on, let's leave!"

~*~*~*~*~

Isaac pulled his tunic closer to him as he stepped out into the open. It was pouring outside and the wind was picking up. He shivered as the cold wind tugged at his clothing and looked towards his parents.

"Kyle … Will they be able to stop the boulder?" Dora asked her husband quietly.

Kyle put his back towards them and walked forward a few paces. He shook his head, making his wet golden brown hair flop around. "I don't think so … Not for long, anyway..." He faced them once again, "You two go on ahead and take refuge in the plaza,"

Dora looked confused, "Aren't you coming?" she asked.

Kyle shook his head, "I need to help evacuate the other villagers,"

"Let me help you, Kyle!" Dora exclaimed, obviously worried for him.

"It's too dangerous, Dora. Please, just take good care of Isaac!" he protested.

Dora shook her head stubbornly, "Isaac is old enough to get to the plaza on his own," Dora turned to her 13 year old son, "You can find you way, can't you, Isaac?" she asked gently. Isaac merely nodded to her question.

"You know the way - just go south to get to the plaza. Be careful!" she warned him, a slight frown marring her features.

A smile broke out on Isaac's childish face; Mum sure gets worried a lot over me. He thought. "I will!" He promised as he watched his parents walk north towards Mt. Aleph.

He idly looked around him. I should go look for Garet and Usagi … He thought as he ran his hand through his now-soaked golden blonde hair.

Heading north, he stopped at his best friend's house, wondering where on earth Garet was.

"Ugh … Hrnghhh…"

Isaac raised his eyebrows and looked around, finally spotting his red-haired friend pulling a rope all wrapped around a heavy-looking treasure box. Walking up to up to him, he asked. "What are you doing?"

"Isaac, what do you want? I'm trying to save my things!" Garet puffed, his cheeks tinted pink from the effort of trying to pull a huge weight.

Isaac suppressed the urge to sweatdrop as he watched Garet continue to move his trinkets unsuccessfully. "Garet, just leave it!"

Garet looked at him as though he had just uttered something crazy. "What, you want me to just dump my stuff?"

Amusement danced in Isaac's blue eyes as he nodded.

"You think I should just forget these things and save my own life?" Garet questioned his best friend. Seeing Isaac roll his eyes, Garet came to a decision. "You know, your right. OK! Let's get out of here!"

Both boys ran towards the bridge, west of Garet's house. When they felt the ground rock heavily. "Argh! The boulder! It's falling!"

Garet and Isaac looked towards the cliff, and saw four Adepts using their Psynergy to try and hold the boulder. "Ugh … Ugnhh … It's too heavy! We can't hold it for long!" One of them shouted.

"If our Psynergy runs out, Vale will be destroyed!"

"We have to hold on until the villagers are safe!"

One of the four men stopped using his Psynergy and looked down, he was surprised to see Isaac and Garet staring up at them. "Hurry, boys! Run!!! It's just a little further!" He called to them.

Garet tugged at Isaac's arm. "Come on, Isaac, run! The boulder's coming!"

They raced back through the bridge and down south towards Isaac's house.

"Ahh!" Isaac and Garet came to a screeching stop.

A smaller boulder blocked the stairs, which could take them to the plaza in a shorter amount of time. Usagi huffed indignantly at the offensive rock blocking her way. She kicked it. "Ouch!" she cried, holding her sore foot. Her blue eyes started to collect tears.

"Usagi!" Isaac called to her as he tried to stifle a laugh.

The blonde girl looked up at him with her captivating blue eyes. "Isaac, Garet? What are you doing here? I thought you were at the plaza already."

"You okay?" Garet asked.

Usagi nodded, "Yes. Thanks for asking. But …" Usagi switched her sapphire gaze to the rock that blocked the way and her companions immediately got the idea.

"We can't get around the rock, we'll have to find another way." Garet told her a kind smile on his face.

Usagi sighed, "Alright, alright…"

They jogged over to the stairs nearby and another boulder blocked the way. "Ugh!" Usagi tugged at her hair in frustration. "I hate these rocks!"

The ground trembled. "We've got to hurry!" Isaac cried. He grabbed Usagi's wrist and pulled her. Once again, they trekked north and to the western bridge. Walking down the stairs, another boulder rolled and blocked the south pass.

A vein popped up on Usagi's head. Isaac tightened his once-loose grip on her wrist and pulled her to the path in the west.

"Hey, it's a man!" Usagi cried, spotting a person lying on their back. "We've got to help him!"

She pulled her wrist out of the surprised Isaac's grasp and ran over to the man, kneeling next to him. "Mister? Are you all right? Would you like any help?" she asked.

Isaac watched her. Usagi, always putting people first. No wonder she's Vale's most treasured girl. He thought.

"Rockslide … destroyed fence… monsters everywhere." The man mumbled. "I'm hurt pretty badly … Do you think I'll die?"

Usagi immediately shook her head, "No! Of course not!"

"This is awful. I'm left here for monsters to …" The man stopped and blinked before standing up. "Wait … that's strange … I'm not hurt at all! But I'm serious about the monsters. Be careful on your way to the plaza!" The man ran off.

Usagi sweatdropped. "…Monsters?" she asked, her eyes widening in fear.

"Don't worry, Usagi! If any monsters pop up, Isaac and I will be here to rescue you!" Garet promised, as he puffed his chest up in pride.

~*~*~*~*~

The group of three kept walking south, towards Jenna's house. Usagi stuck to both Isaac and Garet closely as her blue eyes scanned the trees and bushes surrounding them.

"Oh no! My brother!"

"Hey, that's Jenna's voice!" Usagi gasped. They exchanged looks before sprinting towards the house nearby.

"Hang on Felix!" – It was Isaac's dad.

"Felix will be alright. We'll  find a way to save him…" Dora said a little hesitantly.

Usagi arrived at the scene, Isaac and Garet just a few metres behind her. Her blue eyes winded and a gasp escaped her mouth as she watched the scene unfold before her.

Kyle was kneeling near the edge of the water, Dora behind him. While Jenna was behind her parents. A few metres, hanging onto a broken wooden pole was Felix. Suddenly Felix was submerged into the water. "Nooooo! Felix!" Jenna screamed, and got ready to dive in, only to be pulled back by her mother the exact time Felix resurfaced.

"The rope won't reach… We should use Psynergy. Do you have any left?" Kyle asked

Jenna's father shook his head. "I've used all mine up. What about you Kyle?"

Kyle's eyes darkened, "I'm drained from helping the other villagers."

"We have to get help." Dora suggested

"Can Felix hold on long enough for us to find help?" Kyle asked uncertainly.

"There's nothing else we can do from him here, is there?" Dora remarked. No one replied, knowing that Dora was right.

"Then go get help, but be as quick as possible!" Kyle ordered.

"Jenna, can you go too?" Jenna's father turned to her, a hopeful look in his eyes. Jenna immediately nodded.

"Your brother's counting on you, Jenna." Dora told the small red-haired child.

"Yeah, I know." Jenna nodded furiously.

"Alright, let's get going!" Dora and Jenna got out of the house. "I'll go look up north. You head for the plaza, alright?"

"Yes ma'am. We're looking for anyone with any Psynergy left, right?" She asked. Seeing the positive nod, Jenna took off.

Dora turned around and saw the group of three. "Isaac!" She stuttered. "You saw what happened?" When Isaac nodded, Dora continued, "I have to go get help before Felix drowns!" Dora pursed her lips. "I don't suppose … Could the three of you help me?"

Usagi didn't hesitate, "Yes!"

"Jenna has gone to the plaza to get help. Go join her." Dora instructed them before running up the stairway they just came from.

"Come on, guys! If we wait any longer, Felix is going to drown!" Usagi started to run.

"Hey, wait Usagi!" Isaac cried, immediately taking off after his blonde friend.

~*~*~*~*~

When they got to the plaza, it was nearly deserted; everyone seemed to be at the entrance of Vale.

Usagi bravely walked up to an old man. "Excuse me, can you use Psynergy?" she asked him, urgency lined her melodic voice.

"Huh? Your asking me if I can use Psynergy?" He asked, Usagi bobbed her head up and down. "If I were ten years younger, I'd have plenty to offer, but I'm too old." He sighed.

"Oh, okay …" Usagi replied, looking dejected for a second. She brushed her wet blonde fringe away from her eyes, keeping her blue eyes narrowed. You couldn't see much when it was dark and rainy. Suddenly, she squinted.  "… isn't that Jenna down there?" she asked, pointing near the entrance of Vale. Sure enough, the red-haired girl was in between two strong looking men and an elderly man.

Garet strain to see where she was pointing at. "Yeah, it is! And she's with my grandfather!"

They dashed over to the group, in time to hear a part of their conversation. "Go aid the elders! The Boulder is too heavy for them to hold much longer." Garet's grandfather directed the two men.

One of the men turned to his partner, "We can't let the Mt Aleph Boulder destroy our village!"

"Let's go help the elders." The other agreed.

Garet's grandfather nodded, "We're counting on you." He told them.

The two men left, heading north towards Mt Aleph.

"Grandpa! Jenna!" Garet called to them.

Jenna turned and smiled at them, "Garet, Isaac … You came to help me?" she questioned, her eyes looking hopeful. Usagi sweatdropped and coughed, making her presence known. "Oh, Usagi! Sorry, I didn't realise you were there since you were behind Garet and Isaac." Jenna exclaimed sheepishly.

Garet's grandfather looked at them, "Jenna told me about Felix. Is that why you're here?" The three nodded.

"Good boys!" Usagi sweatdropped and coughed again, a small frown appearing on her cherub face. "Err… and girl!" Garet's grandfather corrected. "Jenna could use a hand."

"Great, I'm all charged up!"

Everyone turned, surprised. A man jumped down from a huge Psynergy stone. "How are you? Have you recovered your Psynergy?" Garet's grandfather enquired.

The man nodded, "Enough to save Felix, thanks to the Psynergy Stone."

Garet's granfather nodded, "Ok! Jenna, you heard him. Now hurry back!" Jenna nodded eagerly. "The path may be blocked by fallen rocks-" his eyes landed on Isaac, Usagi and Garet in turn, "You three can show them the way."

Jenna looked at them, "… Thank you Isaac." She said softly.

Usagi smirked; Jenna has a little crush on somebody …she thought. I can't believe I missed it when I first met them!

Jenna caught Usagi's smirk, and sweatdropped. "What are you smirking at?" she asked. The only reply she got was a knowing look and a wiggle of eyebrows from the blonde. Jenna turned dark red, catching on to the hidden meaning. "What!?" she cried.

"Come on, we can't waste time!" Garet berated. Girls! He thought, rolling his eyes.

~*~*~*~*~

"Mum! Dad! We're back!" Jenna screamed over the thunder and rain. They were on top of the bridge that overlooked Jenna's house.

"Is that you, Jenna?" Dora asked, coming closer to the bridge, shielding her eyes from the falling rain to see better.

"Yes, ma'am."

"I couldn't find anyone who could help… how did you do?" Dora questioned. The four turned towards the man. The man nodded and walked towards Dora without a word. "Your just in time." Dora breathed a sigh of relief.

"Then my brother is still …" Jenna trailed off.

"Felix is all right. He's hanging in there," Dora assured the worried girl. "Come down here, so we can save Felix!"

They all nodded and walked down the stairs in a hurry. Before they reached Dora, they heard a loud thundering noise.

"What is that!?" Usagi cried, as the ground shook forcefully. Everyone exchanged glances and looked around. Another noise was heard, this time, it was louder. The ground started to shake to some odd beat; the shaking would stop every two seconds before starting again. The ground suddenly lurched, Usagi was thrown off balance and fell onto the ground. "Argh!" She exclaimed, surprised.

"Usagi! Are you okay!?" Garet asked, holding out a hand to the fallen girl. Usagi took it and pulled herself up.

The rumbling started to get louder and louder. Her blue eyes scanned the cliff to the north, before widening in shock. "Run!" She screamed, horrified.

Everyone bolted into safe places. All except Felix, Kyle and Jenna's parents. Usagi's stopped running and turned. "Watch out!" she cried, she was about to run their way when Isaac gripped her wrist, pulling her back.

"No, don't!"

They looked on as the huge boulder fell from the cliff, heading directly onto Jenna's house. It all happened so fast, Usagi felt as if it was a nightmare that she would soon wake up from. She watched helplessly as Isaac's father and Jenna's family – including Felix – let out cries of surprise as they were hit and submerged into the water. The boulder kept on rolling south.

She didn't know what to do, or say. Usagi felt Isaac's grip on her wrist loosen and she fell on her knees, stunned at what she just saw. She slowly turned her head, her sapphire blue eyes staring up at Isaac's own. "Isaac … I'm … sorry…" she forced the words out of tight throat.

Isaac shook his head and looked away from her, blinking his eyes to force his tears back. "Come on," he said softly, holding out his hand to her. Taking it into hers, Isaac instantly felt warmth spread in between their joint hands.

Pulling herself up with Isaac's help, Usagi looked over at Jenna who was staring at the exact spot her parents were before the boulder hit. Usagi felt sympathy and sadness well up inside her chest as she watched her friend's tears cascade down her face.

"Jenna?" she asked softly, putting a hand gently on her shoulder.

"Mom, Dad … Felix … Please … Don't leave me all alone …" Jenna whimpered. She shut her eyes tightly and sobbed, mumbling things under her breath. Usagi bit her lip, feeling awkward.

 "No … It can't be. Kyle … It must be a dream…" Dora whispered. Her usual bright blue eyes were dull, clouded with pain.

"Isaac … The Boulder… We need to get help, or everyone will drown…" Usagi turned, overhearing Garet speaking to Isaac.

Isaac nodded, "I'll go back to the plaza." He started to walk towards the bridge that would lead him back to the plaza.

"Wait, Isaac, I'm coming with you!" Usagi exclaimed, dashing over to him. But before reaching him, knelt next to the man with Psynergy. "Are you alright?" She asked him, an anxious frown crossing her face.

 The man shook his head, "It's no use. I can't move… Isaac, Usagi, please get help!"

Usagi agreed and straightened from her kneeling position, heading towards the waiting Isaac. "We better get moving, or we'll never be able to save them!" She told him, as the duo dashed across the bridge.

Garet pulled himself together just as Isaac and Usagi disappeared from view. "Isaac… I can't let him go alone! It's times like these that we men have to stand together!" He vowed, slamming the bottom part of his right fist to the palm of his left.

~*~*~*~*~

As Isaac and Usagi neared the village they heard hushed voices. Usagi stopped. "What is it?" Isaac asked. Usagi put her finger up to her lips, silently telling him to be quiet. Isaac frowned and strained to hear.

"Only the two of us survived …" a deep male voice sighed.

"How could we have anticipated Sol Sanctum would unleash such fury?" This time it was a woman's voice.

"It's a miracle that even the two of us were spared," the male continued.

"That switch … it must have been a trap …" mused the female.

"But to think it could conjure up a storm this powerful!"

"… Another demonstration of the awesome powers of Alchemy."

"Regardless, we must not fail the next time we challenge Sol Sanctum."

"Next time, we shall certainly…"

"Isaac! Usagi! Wait!" Garet's voice pierced through the air.

Usagi and Isaac turned around, surprised.

"You were eavesdropping on us just now … weren't you?" A male voice enquired, malice lacing through every word. The man had aqua hair and … blue skin. Usagi blinked and looked squarely into his eyes, they were as red as rubies. Usagi swallowed the lump forming in her throat.

Usagi's stomach sank as she looked up at the elevated land a man and woman were standing on. This isn't good… "No! We weren't! I swear, we were only passing by!" she denied while Isaac was shaking his head.

"Isaac, Usagi …" Garet walked over, "They look scary… Are you sure you should be talking to them?" he asked them.

"You must forget everything you heard." The woman told them. Her blonde hair waved through the chilling air. The trio exchanged glances, Usagi's worried, Garet's fearful and Isaac's confused.

"Don't worry … We'll help you forget!" The male snarled, drawing his silver sword. They jumped down and faced Usagi, Garet and Isaac, getting into a fighting stance.

Usagi stepped back, sapphire eyes wide. "Usagi, get back, we'll handle this!" Garet told her, taking a step forward, trying to hide her from view while drawing his Machete.

Isaac followed suit. "Usagi, run!" He instructed her, holding his Machete in front of him.

Usagi shook her head stubbornly, "No! I'm in this as much as you guys are!" she argued. She pulled out a small staff with a sapphire gem on one end from a hidden part in her robes.

"Such a determined girl, aren't you?" The male asked, a smile forming on his lips.

Isaac attacked first, slashing at the male with his Machete.

The female laughed, "Flare Wall!" She cried, she held her right hand, palm facing the trio. Fire appeared out of nowhere, enveloping them in flames.

The trio blacked out.

~*~*~*~*~

Whoa, that's pretty damn long for a prologue, ne!? 7 pages … amazing … I only made up 1/7 of the words they're saying. The rest is exactly how it is in the game. So … what pairings do you want? ^_^

Usagi with:
Isaac
Garet
Alex
Felix
Saturos

Jenna with:
One of the guys that I already mentioned. (Except Felix, cuz that would be incest! Eww!)

I'm kinda leaning towards the Usagi/Isaac and Jenna/Garet pairings.

Or a love triangle where Isaac and Alex are both trying to get Usagi. ^_^ Hehehe!!!

Vote for your fav couple!!

Much Love,
~*~Angel-Goddess~*~

Aka Tenshi-Megami