Disclaimer: My first Diablo 3 crossover with Final Fantasy Advance 2 Grimoire of the Rift! Since no one seem to post a Final Fantasy cross Diablo, I figure I should make one just to start the tread. And no, I'm not going to bring in any character from other Final Fantasy franchise. These heroes are mostly Original Character, from the character creation in the game proper. It's a Final Fantasy Advance 2 Grimoire of Rift character using the Diablo 3 character sheets, and that means these OC is as overpowered as the main 6 cast in the Diablo 3 universe. And I'm going to break that system apart!

Final Fantasy Advance 2 Grimoire of the Rifts belongs to Square Enix

Diablo 3 belong to Blizzard Entertainment

I own nothing but these Original Characters

Through the Grimoire: Diablo 3
Chapter 00 - How it came to be...

Sanctuary, Arreat Crater …

Deep in the once proud and holy lands roam by the Children of Bul-Kathos, under the layer of demonic tangle mess of flesh, Brimstone and fire, the demon Lord of Sin stares at the magical sphere that allows him to view the world of Sanctuary without him leaving his prideful throne of bone, flesh and fire. He stare with his fiery burning eyes at the prize, locked in Bastion Keep, the creature had its attention glue to the Black Soulstone, attempting to pacify the wrath of his fallen brothers locked in that pathetic stone. Oh, how he wanted the stone, to be whole again, while gleefully belittle his siblings for being foolish they were. The Lord of Sin will prevail.

And yet, he is overcome. He is now worried. Worried beyond even what the Lord of Terror usual shenanigans upon his own brothers.

Fear grip tightly on the Lord of Sin.

Bastion Keep was the forefront of his global domination to Sanctuary; an obstacles that need to be removed before he can continue his army of Sins to the rest of this pathetic, wretched world. He has unearth millions of his demonic Army to the human creature fortifications, and from what he understand, Bastion Keep is undermanned. Barely even a thousand men before the invasion, is now reduce to mere 300 or so soldiers. That was weeks ago, and for a siege to last this long against his horde of unrestricted demon Army is impressive – the Lord of Sin remarked – but are less impressive over his own feat of accomplishment when his army manages to break siege into the High Heaven very gate before his idiotic brother, Lord of Lies attempt to coup the entire operation resulting an infighting against its own – in front of the High Heaven angelic forces no less! It was bad enough to have victory so close to being foul by your own brother, let alone in front of the 3 Great Evils.

No. The Lord of Sin was not overcome any setback by a mere misguided Lesser Evil or the Greater Evil. Nor was it due to a sudden influx of human reinforcement. No, it was overcome by the Heroes of Ivalice. Five heroes from an unknown origin help the defenders in an astonished rate and this made the Lord of Sin plan to conquer Sanctuary and claim the Black Soulstone as his own a lot further than anticipated.

His planning was flawless, sending the forefront of his forces to assault the wall defenders, his catapult raining ballistic against the very wall of the crippling keep and his agents attack the keep from within, butchering the unknowing defenders where their focus are elsewhere. And yet these Hero's ruin his plan with strange magic and weapons. For the demon lord, he is not pleased.

No, he is furious.

Reports from the front give the Lord of Sin a good picture who they are fighting against. The first member appears to be human of sort. The human, in the Lord of Sin eyes, would deter it to be the rebirth of the dreaded Nephalem – how else can it be when this human carries a two holy greatsword, teleport across the battlefield as fast as you could blink, brimming with massive reserve of energy to yield out the elemental might of magic that could eclipse Sanctuary landscape and summon forth unknown gods from unknown origin? The Lord of Sin grumble in annoyance when report of his surviving demon troops recount their experience against this mortal man who fought Ghom, the aspect of Gluttony. According to said report, the mortal tore through the labyrinth halls of Bastion Keep to confront the aspect of Gluttony. Ghom put up a good fight against this mortal man, but remark from the human were 'You should learn a thing or two from King Malboro; you're bile of vomit and foul fume is tolerable at best' before killing the aspect of Gluttony.

Hmm, perhaps he should find out who or what this King Malboro is.

Other member who accompany the Nephalem were another humanoid female creature that would very well be a rare elf of sort, since she is impossible tall for a human creature, has long rabbit like ears (fluffy too, according to his demon army report – how the Hell did these hell spawn knows it's fluffy is beyond him), and seemed to carry an equally large greatbow. Some of the astonishing feat his demon army reports were as follows; capable of sniping a thousand kilometres under the worst (read: pleasant) stormy weather on top of the tallest Bastion Keep tower, summoning the elemental aspect of power to her aid, and altering the flow of the wind to her side. One of the report which baffled the Lord of Sin was 'summoning a demon army of her own'.

Which demon army? The Lord of Sin is the only demon lord to amass a great number of powerful abomination to ever walk on the Burning Hells and had these monster serve him. Heck, some he even personally create to counter other elements of aspect. The Lord of Sin is truly intrigue, if not a bit frighten.

The next companion of merry-too-goody was a stuff animal. No seriously. That's what it said in his report. The creature is small, no taller than an Imp with a round fluffy ball that seemed to be dangling in front of its head and a cupid-like wings. How this thing is seriously hampering his demon army however is its weapon it is using. For some reason, it can conjure magic of fire, ice and lightning, armed with a knife with runic powers, fires what appears to be a metal pipe of fire (flintlock) or occasionally a huge metal barrel that spew metal and fire (Cannon). Most account says that this stuff animal rode a giant feathered prehistoric bird of prey to battle, and the one hero among many that destroy his siege weapon just across the bridge to Bastion Keep. The ominous 'Kupo!' that this being cried has now become something that the demon army dread to hear the most.

The day that even a stuff animal able to best his demon army is the day he should call off the invasion, make amend to all his evil brother (and a sister) and go for a century long holiday, having a nice cocktail of demon blood, brains and eyeball while watching sob opera.

Of course he is quite livid at this very moment.

The fourth member is humanoid, but very scaly and appear to be war-like vagabond than a hero. Appearing like a lizardmen (complete with long thin tongue, sharp tiny but razor sharp teeth and a long reptile tail), what the Lord of Sin reads in the report from the front was how powerful these fourth hero is; this lizard creature took on the 10 Siegebreaker Assault Beast, alone. And emerge victorious. The Lord of Sin is obviously flabbergasted as to how this is even possible; even the angelic being of the High Heaven need the power of the Archangel of Valor to bring a single Siegebreaker down, and that was between breaks. This fourth hero took all ten without a single break.

The Lord of Sin could do nothing but to shred this particular report to ribbons (and kill his demon messengers) for such a tall tale. He will not believe a single thing about the lizardmen. He will not acknowledge this hero to be able to jump hundreds of feet into the air, nor the fact it can block and counter the attack with nothing but its bare hands, nor the fact that it can petrified his demon army in place via strange magic. Oh, and forget the fact that it can somehow breath fire, lightning and ice from its mouth. This not the Lord of Terror here.

The last companion of all is a docile humanoid creature with dopey eyes, nose and ear, carrying a staff of magical property and wears a heavy garment. The Lord of Sin grumble aloud at the description of this last hero. For all he knows, it may as well be a dog of some sort. One of many account includes summoning the very cosmic powers of reality, bending time and space with its unfathomable power, or cause geographical damage across the battlefield. That, and some report from his demon minion that reads 'forcefully redirect the other minion to turn against one another for a brief moment, causing an infighting.'

The report of all these heroes are concerning, but it only made it worse when said heroes is now spearheading towards his lair. The Lord of Sin engineered the tower of Sin to be as labyrinth as possible, and throw as many demon on the pathway as much as possible to tire these heroes down. He even set up the Maiden of Lust to slow these heroes down as well as her daughters, but he knew it would be nil. The Sin Heart at each layer of his Tower empower his demon minions, and already he notice a few beat miss. He could only prepare himself for the worst, as these Heroes of Ivalice is coming for him.

As the Lord of Sin stood in the Heart of Sin – his throne room – thinking of a way to counter this outcome, he heard footsteps slowly reaching towards him. The Lord of Sin look at all five of them with his six eyes, all burning in fiery rage. He will not be taken. He will not lose to these lowly creature. He will not allow these so called heroes to win. Azmodan, the one of the many Lesser Evil, Great General of the Burning Hells, and the Lord of Sin will not go down without a fight.

"Nephalem fool! When the Black Soulstone is embedded in to my flesh, the Great Seven shall be as one within me! I will be whole! I will be the sum of all hells! I will be... THE PRIME EVIL!"

"Really? 50,000 gil says he'll be down in 10 turns." The human Nephalem reply with a smirk.

"I wager that by double." The elf woman said in deadpan voice.

"Kupopo! I'll stick with 50,000 gil." The stuff animal decry.

"Don't bother, hissssss going down in 5 turnssss" The battle hungry lizardmen hiss, chuckling as he crack his knuckles.

"I'll just sit this one down. Tell me when you need me to heal now..." The docile humanoid reply lazily.

Azmodan, clearly not amuse, "Arrogant Nephalem! My servant will feast on your pride as they devour your flesh!"

CHAPTER 00 END