Yet another story, however this one has the honor of being the first official Percy Jackson and the Olympians and Oh!/Ah! My Goddess Crossover. To those who have no idea about Oh!/Ah! My Goddess. I'll try to explain what I can. This chapter has a lot of exposition and explanations. The Next will skip straight to the beginning of the Sea of Monsters. Some hints will be given about what happens between the summer quests but not a lot.

To those who do know of Oh!/Ah! My Goddess the series will start up around or slightly after The Titan's Curse.

I'd recommend reading Divine Blood by Thrythlind You'll need to know about Ranma ½ and Full Metal Panic to fully understand it but much of the spell concepts will be coming from it. (Also it's very mature and quite horrific, especially when it comes to the characters of Zeus and Poseidon)

At the end of the Chapter I'll give a short overview on the O/AMG aspects and the possibilities of the pairing.

Chapter 1

The Reveal

"Yggdrasil – Remote Access. Third-Class Special Duty Authorization. Local Area Lockdown. Full Release Request. 'Radiant Fortress' Requisition Request, 'Tri-Gungnir' Requisition Request, 'Fading Moonlight's Whisper' Requisition Request. Authorization Code: 'Ill Met by Moonlight Proud Titania'" Everyone froze, Ares, Annabeth, Grover, Hades from the Underworld and even the Olympian Council watching from Olympus.

Percy Jackson the son of Poseidon had just shouted out a long string of instructions, Dionysus was about to start laughing at the apparent madness of the boy when a holographic blue screen appeared in front of him.

Yggdrasil Remote Access Terminal (Error – ID not Found)

User Request from: Y-No-Nr-02-01 – PBP-384

Pending

…

…

Granted.

Full Release Authorized.

Weapon Release Authorized.

Ascendance Protocols Online.

Masking Program Disabled.

Personal Instructions from Kami-Sama

'Show that pathetic Greek War God how a True Norse God Fights'

Suddenly Percy Jackson is engulfed in a blinding white light, when it dissipates moments later everyone gasps.

Standing before them in radiant white plate armor is Percy Jackson, his armor is silver but has golden embellishments that forms the image of a giant tree with his arms covered by branches and his chest being the trunk of the tree.

In his right hand is a brilliant Trident with golden blades, the centre blade has a hollow cut-out in the centre of it and the outer blades have a small indentation on the inner side that begins a couple of inches down from the top. The three blades all join together to a hollow ring of metal that in turn connects to the shaft of the weapon, on the other end of the weapon is a foot long blade. The Trident is made out of the same silvery metal as the armor.

On Percy's back is a bow of exquisite quality, it is rather simple with only a few winding vine embellishments, but it radiates an aura of power the belies its four foot size. Its bowstring appears to be made out of woven moonlight, curiously there is no quiver for the bow, but the watchers all guess that the bow can summon or create arrows.

Both Artemis and Apollo stare at the image of the bow with great desire (Artemis) or just plain out drooling (Apollo)

Hephaestus stares at the arms and armor now covering Percy Jackson and wonders if he could speak with the creators of such masterpieces.

Aphrodite is more interested in Percy himself, marking his face are three symbols, a blue and silver swirl mark on his forehead and two blue points underneath each eye.

The rest of the gods are watching in awe or jealousy, except for Ares who is both jealous and slightly terrified of the weapons and power emanating from the… Demigod? Suddenly the screens of Olympus and the Underworld go dark as Percy activates a shielding spell to prevent being observed.

Percy sighs causing a slight mist effect to appear as his super-energized breath contacts the mortal air "I wish I didn't have to go this far Ares, but you stupidity and oversized Ego has lead to you to begin a chain of events that could have destabilized the entire world. As it stands I must remedy this problem, now I face you as I truly am. I am Perseus Belldandyson Poseidonson, Third-Class Special Duty Unlimited, God of Creation, Wisdom, Fate and Heroes. Prepare yourself, War God for the punishment you so rightly deserve"

Ares scowls in anger and his sunglasses nearly melt from the energies flaring out of his eyes "You dare mock me, I'll show you…" before Ares can finish his threat he is launched backwards as Percy suddenly appears in front of him with his trident extended like a bat or club.

"Yes? You'll show me what? You are at most a Second-Class God, I am only Third-Class due to experience, if you were to go by power, I am a First-Class Unlimited equal to what you would consider a Titan Lord in power" Percy sighs again, as arrogant as he must appear, he absolutely hates to speak as he currently is. However he knows that keeping Ares unbalanced is the only chance he has of surviving. Despite being weaker Ares has the experience of Millennia, he just hopes that his mother never finds out he acted like this. She might appear to be slightly naïve and ditsy, but the Norn of the Present is more than terrifying when properly provoked. Considering she used to be one of the best Valkyries in Asgard, Percy definitely did NOT want to anger his mother.

Ares angered beyond all belief charges forwards with absolute disregard to his own safety (or even any semblance of a plan) and Percy does what he has been trained to do for several years, he sides-steps the seemingly undodgeable charge and uses the short blade on the end of his Trident to strike at the charging God.

The squeal of complete and utterly soul destroying pain that suddenly rings out makes Percy look back to Ares and flinch violently, causing yet another squeal of unimaginable pain. Percy carefully removes his blade from the… remnants of Ares family jewels, and then has to fight with all of his willpower not to vomit. Percy nearly drops his Trident but manages to recover and puts his trident blade at Ares' neck "Surrender or… you know what just surrender, I can't really do anything more torturous then that" Ares shakes his head so fast Percy is amazed that it doesn't fall off "Maybe Apollo will be able to fix it?" Although Percy's voice doesn't really install confidence in anyone listening in.

Grover walks over and puts his hand on Ares shoulder "You poor bastard" then Grover shakes his head and looks at Percy

"What?" Percy queries with a look of confusion (and nausea) on his face

"Pe-e-e-ercy if you ever do that again… I'm gonna not be friends with you anymore" Grover bleats out with a fair amount of fear in his voice.

"S-Seaweed brain, was t-that r-really necessary?" Annabeth asks with a fair amount of horror in her voice.

Percy shakes his head "No, nor was it done on purpose. I reacted instinctually as I was trained to do so…" Percy then scratches his head and thinks for a second "Then again, the women I trained with were all pretty anti-male, I wouldn't put it past them to train me to purposely go for groin strikes against male opponents"

Annabeth looks at him with confusion "Who exactly did you train with?"

Percy sheepishly grins "The Valkyries of Asgard"

Annabeth's jaw nearly hits the core of the Earth "Wait, wait, wait… Are you saying that you trained with members of the NORSE Pantheon?"

A light voice then answers Annabeth "Of course, who else would I have train my son?"

Annabeth spins around only to spot the most beautiful woman she'd ever seen. Standing before her is a woman with brown hair and expressive blue eyes, standing about 5'1" like Percy. Also like Percy she has markings on her face, a tear drop diamond on her forehead and two horizontal triangles with the points facing towards her nose about a inch under the outer most parts of her eyes. She's wearing a strange blue dress and a some interesting golden earrings.

Percy smiles at his mother "Annabeth, Grover I'd like you to meet my mother Belldandy, the Norse Goddess of the Present"

Annabeth frowns at the strange disconnection, the Present while massive doesn't sound all that impressive, so why were her senses screaming that this kind looking Goddess was the biggest threat she'd ever faced "Forgive me if this sounds rude, but if you're the Goddess of the Present, why are you so powerful?"

Percy and Belldandy both start laughing. Annabeth looks between the mother and son duo repeatedly "What's so funny?"

Percy slowly stops laughing and looks at Annabeth "Annabeth, my mother is one of the Norns, one of the Norse Fates and one of the Administrators of the Yggdrasil Supercomputer, essentially you're looking at one of the three Goddesses tasking with keeping Heaven and the Mortal World separate yet interconnected. There are very few beings in this world stronger then my mother, also those earrings of hers are sealing away a good portion of her power. What you feel is around twenty percent of her true power"

Annabeth nods vacantly as the full implications of the Goddesses power come flying home and she asks vacantly "Why were you able to train Percy, I thought the Ancient Laws…"

Percy interrupts her "Don't apply to any deity that isn't Greek. Those are Greek laws, also I'm a full-fledged God, not a Demigod. The only laws I'm bound by is the Minimal Mortal Interference Law and the Peace Treaty between Asgard and Niflheim"

Annabeth frowns in confusion "Niflheim? What's that?"

Belldandy answers "The Norse Underworld, technically. In actuality it is the collective dark side of all Pantheons except for the Greco-Roman Pantheon. Same as Asgard is the collective term for both the Norse Pantheons home and the Homes of all Pantheons except for the Greco-Roman Pantheon"

Annabeth looks at Percy and Belldandy with shock in her eyes "Greco-Roman?"

Percy just raises an eyebrow "After the Rise of Roman the Greek Pantheon was permanently bound to the Roman and vice-versa. As such your Pantheon can only be called Greco-Roman as it is a conglomeration of the Greek and Roman Pantheons. Although a better title would be the Western Pantheon"

Belldandy interrupts before Annabeth can ask another question "As interesting as all this is, my apologizes for interrupting. We must be on our way, after all we are on the eve of a War that could bring about Ragnarok"

"Yes and we don't want that"

Percy and Belldandy turn to see Hild, the Daimakaichō (Ruler of Hell) standing there on the beach holding the Helm of Shadows. "I'll return this to its proper owner, you two deal with the bolt" Hild then vanishes into a puff of smoke.

Annabeth watches on in horror "Who was THAT?"

Percy shrugs nonchalantly "The Ruler of Niflheim, Hild"

Grover shakes himself out of the reactionary terror he had from Hild's appearance and interrupts with "Come on Annabeth, we need to get going"

Annabeth then asks the next obvious question "How are we going to get to Olympus?"

Percy grins and holds up three plane tickets "Why we fly of course! Zeus isn't going to attack us in the air as it would result in the loss or destruction of his Lightning Bolt, so for now we're safe. Although I doubt I'd be able to fly within America again after today, unless I've done something truly amazing"

Belldandy smiles and kisses Percy on the forehead "I must go, I will see you in Asgard Percy" Belldandy then vanishes into the reflection on Percy's Armor.

Despite his companion's desire to interrogate him, Percy manages to get aboard the flight and get to New York with a minimum of trouble. He then says good-bye to his quest mates and heads for Olympus.

As he arrives in the Lobby he sends a silent prayer to Zeus requesting the right to enter Olympus. The Lobby Guard then puts a hand to his earphone and waves Percy over. He hands Percy a keycard "Place this in the slot in the elevator and press the button that appears"

Percy walks over to the elevators and enters an empty one. Placing the card in the slot he hits the button that appears and ascends towards Olympus.

Percy steps out of the elevator and is distinctly… underwhelmed. Then again he was used to Asgard which is many times larger and grander then Olympus, he shrugs off the small spike from Yggdrasil indicating that a hard point was nearby. If what he thinks is about to happen in the next few years is correct then activating the Yggdrasil uplink fully would be disastrous… or at the very least a big mess that would require hours of bug hunting and re-coding.

Percy quickly makes his way to the Throne Room of Olympus, ignoring the looks he gets from the residents of Olympus due to his armor.

He enters the Throne Room, right into what looks like a full meeting of the Olympians. Ares limps in after him. Percy knows that it's stupid, dangerous and kinda vicious but he just has to "Hey Ares, sorry about the castration, it was an accident" Ares glares at him with massive amounts of venom, but it's tempered by the fear and remembered pain in his eyes.

The Gods upon hearing all wince and look at Ares with pity… Except Hephaestus who is laughing uncontrollably at his brother's misfortune.

The Goddesses all have varied responses, Demeter and Hera are a mix of pity and smug satisfaction, Aphrodite is glaring daggers at Percy, Athena is shaking her head at the stupidity of Ares and Percy and Artemis is torn between laughing uncontrollably, congratulating Percy and wondering whether or not she should talk with Percy and ask why he did it.

Percy then raises an eyebrow at Ares and continues with "If you keep glaring at me like that then I'll show you some of the other things I have been taught by the millennia old female warriors who have a strong dislike of males like yourself" Ares quickly walks (read: runs like a headless chicken) towards his Throne.

If Percy had been looking he would have seen the looks of intrigue on Athena and Artemis' faces.

Percy walks up to Zeus and bows "My Lord Zeus, I present to you the Master Lightning Bolt. This makes us square on the desire for you to kill me right?" Percy places the Lightning Bolt on the ground.

Zeus smiles at the impertinent comment at the end, he might end up liking this Demi… no this God. Zeus opens out his right hand and the Bolt flies to him while returning to its original form of twenty feet of pure energy "It does indeed and thank you for returning it to me. Now would you mind explaining to me exactly what you meant when you introduced yourself as the god of Creation, Fate, Heroes and Wisdom. I don't believe that you have ever been introduced to this council"

Percy winces as he realizes that he revealed that much "The reason for that Lord Zeus is that those are my Norse Domains. I have no Greek Domains as of yet and as such I am not bound by the Greek Ancient Laws nor the Roman Divina Cohibita but instead I am bound by the Norse laws regarding such things"

Zeus flickers and in his place sits someone nearly identical but with slight changes. Whereas Zeus is a tall, imposing, and very muscular man, with long black shoulder-length hair with a gray-and-black neatly trimmed beard. He has brilliant electrically-blue eyes with a serious and proud, but very handsome face. Now his face has a more dire set to it, like a warrior who has seen many things and a General who has had to order men to their deaths just to save others. Percy immediately knows that he is looking at Jupiter.

Percy nods slowly "Lord Jupiter, so that is what happened. Strange, very strange. I will have to indicate…" Percy's voice lowers slightly and he starts to mutter about 'file integrity' and 'duality of divinity' and many other computer and mythical terms. Eventually Percy shakes himself out of this state and says "My apologizes I was distracted by my duties. Was there something you wished to say Lord Jupiter?"

Jupiter nods slowly and asks "If what you say is true, then there are other Pantheons in this world. I wish to know, why am I and Zeus bound together in a single body?"

Percy shrugs in confusion "I honestly don't know, it could be something as simple as over-resonance to something as complex as a dual file fusion right down to the kernel. In either situation it would be impossible for you and Zeus to separate, you have been bound together for so long that the borders between the two of you are very thin. Eventually you'll combine into a new god I would imagine. Although perhaps if I used a counterpart system via the use of the Doublet system and both Yggdrasil and Nidhogg I might be able to separate the two of you. But that depends on my getting permission to do so from Kami-Sama"

Athena interrupts at this point "Kami-Sama? Who is that, Odin?"

Percy shakes his head "No, you would call him Chaos. The Creator, the first being. I need his permission to do something on that level and I'm afraid that the reputation of the Greek and Roman Gods would prevent that" unnoticed to Percy Jupiter flickers and becomes Zeus

Before Athena can ask another question Apollo buts in with "What's Yggdrasil"

Percy can't believe it, he just stares at Apollo in shock, before he states "Are you telling me that you have no idea about the source of your immortality and your powers!"

Athena immediately pounces on that exclamation "The source, so this Yggdrasil is the source of divine power?"

Percy shrugs and says "More like the supercomputer upon which all of creation is stored and documented. All except for your Pantheon. The last files on the Greek Pantheon were of the Primordials fighting the Titans, after which the Yggdrasil hard line to your Pantheon was severed. Resulting in the possibility of fading and weaker power levels"

The makes all the Olympians look at each other in concern "Can it be fixed?"

Percy shakes his head "Not immediately, it will take a while. But within the next decade yes, but it won't be easy. You'll have to learn Yggdrasil operation protocols or Nidhogg operation protocols depending on alignment"

Zeus raises an eyebrow "Nidhogg?"

Percy looks at him seriously and then says "Where there is a Heaven, there is also a Hell. Nidhogg is the Supercomputer of Niflheim, the demons. Which are not as bad as you would imagine. They mostly just try to take humans souls via contracts. Just beware anything with glowing red writing on it that you have to sign for. There'll always be fine print that'll benefit the demon in question"

Poseidon speaks up "Would we be expected to follow such conventions?"

Percy shakes his head "Not really, it's your choice as to which side to follow and it is also your choice as the dominant Pantheon as to how your people act. Connecting with Yggdrasil and Nidhogg merely means that you cannot start wars with the opposite faction and that you have to follow orders from you respective faction leader. Kami-Sama takes a hands off approach and Hild usually lets you do as you wish as long as you meet the quota of human souls, don't rebel against her and don't start a war with Heaven"

Athena looks suspicious "That seems too loose, there would have to be some restrictions"

Percy shrugs "Like I said, it depends on what you decide, This is your territory. The two systems simply prevent you from fading, provide power, tools and reinforcements and in return you simply have to follow the basic laws of each side. You'd have to ask the leaders for more information. I don't know many of the laws of either side due to the fact I'm a child of a Norn. I'm less bound by restrictions and such because of this"

Demeter leans forwards "The Norns, aren't they the tenders of Yggdrasil?"

Percy smirks at Demeter "You know that simply because Yggdrasil is called the World Tree in mythology don't you?" Demeter blushes but nods "You're correct, the Norns are the System Admin of Yggdrasil. It's their and my job to maintain Yggdrasil's most basic functions, although we do have other responsibilities. Also in case you were wondering Yggdrasil actually is a giant tree, that happens to be a supercomputer" Percy waves his hand and a picture of a beautiful city surrounding a giant tree is seen "This is Asgard and in the middle is Yggdrasil's Central Core" Many of the Olympians are gaping at the image.

Percy then receives a message written in some language the Olympians can't read "I'm sorry, but I'm being recalled to Asgard. I must leave soon. Please be careful Yggdrasil is beginning to log requests from Kronos. His powers are beginning to return and we can't cut him off without risking a cascade failure that could destroy all of you"

Percy with a wave of his arm makes a puddle of water appear, steps into it and vanishes.

Hermes looks around at the rest of the Olympians and says "I don't know about the rest of you, but that was one of the coolest exits I've ever seen"

Oh!/Ah! My Goddess Codex.

Yggdrasil: Yggdrasil is the supercomputer of Asgard/Heaven, through it divine beings receive their power and limitations and mortals are observed for the possibility of receiving 'wishes' from divine beings. Superficially it resembles a helix of thin wooden trunks with random branches when seen on Earth. Most of the time it appears as holographic screens, although 'Harp' keyboards can be seen occasionally on Heaven/Asgard.

Nidhogg: Nidhogg is the Niflheim/Hell version of Yggdrasil. Through it infernal beings receive their power and limitations and mortals are targeted for contracts that will take their soul. The only images of it seen so far are large holographic screens. However I will take inspiration from Thrythlind and have it resemble a giant curled serpent that flies in the atmosphere of Niflheim.

Classification: Gods and Demons are classified by their Power, Employment and then skill. The known Classifications are First-Class, Second-Class, First Category, Second Category, Special Duty, Limited and Unlimited. Any others are just speculations.

However the system I'll be using is:

Power Wise.

Zero-Class (Kami-Sama/Hild)

First-Class (Planet Busters. Belldandy, Kronos, Zeus)

Second-Class (Continent Annihilators. Urd, Artemis, Athena)

Third-Class (City Destroyers. Hermes, Dionysus)

Please note that Classifications depend on having access to Yggdrasil, without access all of the Greek Gods would technically be Sub-Third Class and Titans would be Third-Class. Hence Percy will be stronger then the Olympians until Yggdrasil Access is restored

Employment Wise

Zero Category – Pantheon Leaders

First Category – Yggdrasil/Nidhogg Tenders

Second Category – Wish/Contract Granters

Third Category – Restaurant owners, Merchants, Etc.

Fourth Category – Children, infirm.

Special Duty – Soldiers, Defenders.

Skill Wise

Limited – Divine/Infernal being is restricted to twenty percent of their power.

Semi-Limited – Divine/Infernal being is restricted to fifty percent of their power.

Minor-Limited – Divine/Infernal being is restricted to eighty percent of their power.

Unlimited – Divine/Infernal being has no power restrictions and may release limiters as needed for the situation at hand.

Limiters: Due to the massive effect fully power Divine or Infernal beings have upon the world at large most are restrained by 'Limiters' present on them at all times. For females these take the shape of ornate jewelry usually earrings or bracelets. Hild (The Ruler of Niflheim) for example wears multiple limiters on all limbs and even woven into her hair. For Males it is usually a cloak or breastplate depending on their nature.

Kami-Sama: O/AMG! fans might say, wait a minute isn't he supposed to be Tyr in canon? The answer is Yes he is. However for the purposes of this story, he will be Chaos. (Unexpectedly making this also a PJO Chaos story) He is all powerful but hands off, so don't expect him to intervene. (Except in the case of Urd for which he will often intervene in order to fit with the story of O/AMG!)

Percy: Percy is a God in this, so don't expect him to lose. That said, he is also inexperienced and limited. As a Third-Class and later on Second-Class he doesn't have access to all of his power despite being classified as Unlimited. Percy is also a God whose domain is Wisdom, so he'll be somewhat smarter than canon. However his education has been focused on divine and Norse subjects so continue to expect boneheaded remarks and comments just like Canon Percy. He's also very sarcastic and rebellious (Wonder why?) and can't hold back witty or stupid retorts when insulted or he just feels like it.

Pairing: The thing that comes up quite often, what will the pairing be. First of all, should it be Single or Harem. That'll be put to a Poll that'll last one week. Then (by which time the second chapter should have come out) the female/s he'll be paired with will be chosen (I'm not homophobic, but I'll never write slash. Hint at it and mention it yes, but never will I write it as a main pairing, sorry slashers)

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