Disclaimer: First Chapter
Story Start!

A vast mistake.

Allowing a Devil to take over the world had been a great mistake for the Greek mythology, to be sure. With most of their believers gone, and the fact that the supernatural world having been revealed even the believers that they managed to keep had wavering faith. As a result, the gods of the Greek had suffered a major loss to their power.

Over 30% of their combat power dropped nearly instantly.

"Heh... HA HA HA! This is the power I can only use thanks to my legend! Only in the Heavens can I use this sort of power, amazing! I'll bring back your heads to my Master."

Oda spoke darkly as she used the Balance Breaker to change her class from Archer into the class that only existed thanks to the new servants that Naruto had fought against. Thanks to the fact his book had come in close contact with a new type of Sacred Gear, he had registered a new class that she could use to transform into.

Oda had not been ordered to attack the Greek mythos.

Naruto gave her no such orders, because she just summoned herself in response to her own wishes. Sure, she was summoned with less power and her connection to Naruto was far weaker as a result, but she was in the perfect location for her to get as strong as she could get.

Absolute Advantage.

When facing Divine and Ancient Enemies, her skills were super effective to the point that you could call her the Anti-Divine weapon. For the ancient greek divinity, she was the ultimate enemy that they should never hope to face off against. At the same time, she had almost no power against legends that had no divinity and no mystery about them.

The Legend Bonus.

"Isn't that right... your head will make a great gift to my Master." Avenger Oda stated as she held up the severed head of Athena herself. The very first of her victims that had challenged her when she invaded their Mt. Olympus. Oda turned her head when a lightning bolt struck the ground next to her and put a massive crater in it.

It would have hit her if she were not standing on a burning mountain.

"Fiend, you attack us when we are weakened."

"Well duh, this was the best time to attack. I can't give my Master a nice present if he is expecting it. I think the heads' of the gods would make for a great gift, to celebrate him ruling the world." Oda stated with a smirk.

Celebration.

She was doing this simply because she wanted to celebrate Naruto's utter domination of the world, and no reason more. She wanted to surprise him for a job well done, and what better surprise than to bring him the heads of the Greek gods? She was going to prove herself as the best servant of them all, and earn his affection. She had no wish that she wanted granted, that she wouldn't take with her own hands. That didn't factor into her decision though either.

"A GIFT! You slaughtered Athena, Aphrodite, and Areas for a GIFT!"

"Their names started with A, so they had to go first, duh. I want to present my Master the heads of his future enemies in alphabetical order." Oda stated with a roll of her eyes.

It was suppose to be obvious.

Zeus was not pleased in the slightest, and created multiple bolts of lightning in his hands.

"Who do you think you are?"

"I am Demon King Nobunaga, the enemy of gods and Buddha, and all living beings. I am the most loyal servant to my Master, and will stand by his side as his greatest general."

Oda turned to face the entirety of Mt. Olympus, and she looked at it with hate and scorn. She had no personal hatred for the Greek gods. She hated all divinity as a base of who she was in this form. As it stood, only a few of Naruto's seravnts had the ability to modify their class with the Alter skill. She was lucky enough to be one of them, and she was going to use that power to wage war.

More gods started to show up.

Oda slammed her rifle on the ground, before she started to float in the air.

"Back you fools, minor gods like you have been too weakened to fight this fiend! I can't use all my power with you here!" Zeus shouted out to his fellow gods.

Oda smirked.

"I know..." Oda stated that fact as a giant skeleton started to grow out of the ground. Golden rifles started to grow out of the skeleton, as well as a total of 6 arms. She floated until she was in front of the giant skull of the skeleton, and she looked down at the gods with a deep chuckle working it's way out of her chest. "I can no longer be stopped, no matter what." Oda knew the outcome.

This was why she launched her attack now.

The best enemy to fight against, was an enemy that didn't stand a chance to start with. That was the rules of war to a T, fight battles where victory was a promised outcome. Zeus, even now, was gathering all of his power and preparing to use it to thwart her schemes.

"I will stop you, no fool should challenge the gods."

"If you look down on me as a fool, it will be a fatal mistake. Papiyas Metamorphosis... Demon King of the Billionfold Heavens."

The skeleton opened it's mouth.

The weapons unleashed a hellstorm of billions of Anti-Divine flaming, explosive bullets that all rained down on the gods from above. With Oda's words, her ultimate skill activated, and Mt. Olympus knew flames. The gods of the Greek knew the fires of hell and beyond, and screams of pain and agony as she personally transformed their heaven into a burning afterlife couldn't be more glorious for her.

Zeus threw lightning bolt after bolt into the endless rain of fire, but he could only protect himself as all around him gods and his home burned. In a matter of minutes, all of Olympus was set on fire.

His lightning bolts fizzled out.

When they struck her endless barrage, for some reason his powers were completely negated by her powers. The more of his godly power he used, the less effective it was against her assault.

Was this what it was like for Devils to get hit by Holy attacks?

Was this women to gods, what holy magic was to devils? If so, then he knew exactly what he needed to do to take her down.

"Hermes, call for help from our human warriors-" Zeus watched as Hermes was shot down from the air, and was crippled before he burst into flames and joined the endless pile of god corpses. He was forced to listen to the laughs of their wicked enemy.

The rain of fire didn't stop.

"There is no escape, the second you stop defending against my attack, you die! The gods are nothing but a fleeting dream, you are parasites that seek to fill human heads with hope that praying to you will solve their problems for them. You use and abuse humans to your liking, and then punish them when they fight back... in this world, there only needs to exist a single deity. One day my Master will rule all the Heavens as it's only divine being!" Oda called out as she watched gods try to escape. The second they did though, her attacks hit them and caused them to burst into flames.

The screams of gods were music to her ears.

As Mt. Olympus burned, the fact it was burning only increased her strength further. She was careful to aim, so that the heads of the gods that she needed to be less burned would be recognizable.

"Hades! Brother, hear my call and-"

"No."

"Damnit!" Zeus shouted when Hades refused to be summoned of teleport to their location. Right when he needed his brother the most, he was turned down and left to his fate. Gaia and the Primordials weren't strong enough to help him, since the Primordial Gods of their mythos were weaker than they were. He could try and call them for help, but there was no way they would do it.

The Titans and Primordial Gods were very pissed at the fact that the gods had defeated them and taken Olympus for their own.

Zeus felt his heart get pierced.

"Hu-huh?"

Oda was standing behind him, with her sword going through his chest.

"You weren't dying fast enough for me." Oda reprimanded Zeus for his tenacity. The fire still rained down from above, but at a slower rate now that all the other gods were deads and ALL of Olympus was on fire. Oda's formed changed as she was forced out of her Avenger form and back into her Archer form.

She was out of juice to maintain that form, but as Zeus slid off her blade with his body catching fire on the ground, and beheaded him with one smooth cut.

Oda smiled to herself.

"Yep, this is going to be a GREAT present!"

Chapter End!
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Remember:
Naruto did NOT Order Oda to do this, and he has NO KNOWLEDGE that she summoned herself and changed Class to get this done. Naruto is unaware of the fact that she is an Anti-God type of servant.
He is also only slightly aware that she is kind of insane.