Thought I should do something like this once I introduce a new NP or Weapon to our MC's arsenal. I'll introduce one at a time when mentioned previously each chapter.

Magic-
Age of a New Babylon B+~EX-
Sacrifices weapons/treasures from Babylon into pure mana to make an attack even stronger depending on how much was destroyed. When destroyed, sed treasure or weapon cannot be restored to the King's treasury.

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Zeus: "..."

Indra: "This is bullshit. YOU DIDN'T TELL US YOU HAD MORE WEAPONS LIKE THE OTHER 2!!"

Y/n: "I mentioned my treasury was infinite. It was your decision to be ignorant in wondering if I had weapons as strong as EA and Enkidu"

Hades: "To think we let him power up too?"

Jason: "That's kind of bullshit don't you think?"

Y/n: "I just followed the rules"

I look over to Zeus who was being a little quiet there.

Y/n: "What's with this passive aggressiveness? I thought you'd be the first to be spouting nonsense"

Zeus: "I lost. Nothing much to it"

Y/n: "I'm surprised"

Zeus: "Since we made demands from you, it is only fair you made yours as well"

Y/n: "I won't ask for much"

The 4 sat down in front of me, ready to accept my demands for their loss in the Rating Game.

Y/n: "Zeus, I want you to never utter my mother's name. Ever"

Zeus: "It shall be granted"

Y/n: "Good. Indra"

Indra: "What the hell do you want?"

Y/n: "I'm not gonna ask anything of you"

Indra: "Huh?"

Y/n: "Shiva told me about the situation in India. You've been trying to take over his territory and I'll say this now. He and I are in an alliance. Do you know what that means?"

Indra immediately got angry and banged his hands on the table.

Indra: "DON'T FUCK WITH ME LITTLE MORTAL!!!"

Y/n: "Pipe down mongrel"

Zeus: "Silence boy. You're making a fool out of us who lost"

He glanced over to Indra who sat back down while glaring at me.

Y/n: "Hades, I want your word that you won't come after Eu again"

He didn't say a word but eventually nodded in agreement.

Y/n: "And you"

Jason: "What?"

Y/n: "You are giving one of your Argonauts"

Jason: "What?!"

Y/n: "You wanted to take Mordred did you not?"

Jason: "Well, yes but-"

Y/n: "Then I'm taking someone from you"

Jason: "Urgh.. Which one? There's Atalanta, Caenis, The Discouri, Heracles, Asclepious, Medea, and Theseus"

Y/n: "I'm taking Heracles"

Jason: "WHAT?!"

Y/n: "I've made my decision. You lost"

I get up just as my associates arrived.

Y/n: "One more thing"

Jason: "Now what?!"

Y/n: "Zeus"

Zeus looks up at me with no interest to hear me talk.

Y/n: "I want a bolt of lightning from you"

Zeus: ".. Consider it done"

On cue, a lightning bolt appears as he grabs it like a spear.

Zeus: "Here"

He chucks at me and I grab it with my Caster gauntlet.

Y/n: "The power of light in my hand. I'll be taking my leave now"

Zeus: "I'll be heading off to Olympus now"

Indra: "Tch. Now I have to deal with him and Shiva?!.."

Jason: "Welp, the Argonauts are calling. *sighs* How am I gonna replace Heracles?!.. Maybe that one Roman hero with the same name? Wasn't it?.. Hercu-"

Hades: "I'm off to my realm"

I exit the room with Sirzechs, Michael, Serafall and Azazel at my side.

Sirzechs: "That was a wonderful show you put out there Y/n"

Azazel: "I'll say. Good job kid"

He pats my head as I continue going forward.

Serafall: "I KNEW YOU'D WIN!!! Of course, as Mr. Leviathan, I was certain you'd win"

Michael: "Your legs were shaking the entire time though"

Serafall: "QUIET!!"

Sirzechs: "I was cheering for you the entire time. Say, when did you join in an alliance with Shiva?"

Y/n: "I only said that to annoy Indra"

Michael: "You didn't then?"

Y/n: "No. He offered me his something in exchange for an alliance to fend off Indra. Of course, I rejected it since I don't want to enter some war that doesn't really involve me"

Serafall: "Why did you say that then?"

Y/n: "I wanted to annoy Indra but.. he also selected to participate in the Rating Game. He earned my respect by taking my side so it was only fair I did the same. I'll be letting him know I won't enter the war but only in name"

Sirzechs: "Which would also show to other enemies of his that he has a powerful ally. Smart"

Y/n: "With that, he now also owes me"

I say with a grin on my face.

Azazel: "And there goes the same Y/n coming out again"

Serafall: "What exactly did he offer you?"

Y/n: "Surya's son. Karna"

Azazel: "Karna?!"

Y/n: "He and Surya both agreed, along with getting his consent, that he'd be a piece of mine if I accepted their agreement. I don't really have pieces left over apart from two extra pawns and a bishop piece I got from Rias"

Sirzechs: "Wasn't that for Xenovia?"

Y/n: "Yea. She's now Rias' knight"

Sirzechs: "That's why she asked for the extra piece"

Y/n: "Now that I got an extra Bishop and those 2 pawns, I haven't found anyone worthy of them or if I do, they are too stronger or incomparable for that piece"

Michael: "Like Oda?"

Y/n: "She doesn't fit any of my pieces so I've left her as she is. She lacks the physical strength to utilize the rook's buff to her power. She isn't that great with the sword to be a knight"

Serafall: "You have also used the 2 you have on Mordred and X"

Y/n: "Yes. The two consumed both my pieces. Eucliwood's my Queen, Ahri is my Bishop and the fox girls took 6 of my pawns"

Sirzechs: "I see"

Y/n: "I've left her as a servant although I used a grail to give her a human body"

Sirzechs: "Fascinating"

Michael: "If I may ask, what was that last weapon you used to eliminate Arjuna?"

I look back at him and pull out the katana.

Y/n: "In physical form, it was just a random katana that hadn't been used or finished. It's as Gilgamesh would say, a prototype"

I slowly took it out and showed it to them.

Y/n: "Just like me at the beginning, I was just a prototype. My body was Gilgamesh's prototype so he could be reborn"

Sirzechs: "So you aren't his actual child?"

Y/n: "No. I acquired his DNA when he shoved his heart into my chest to fix mine just pryor to my death"

Azazel: "So your hearts merged or something?"

Y/n: "Yea. Anyways, I always had that thought in my head. If it wasn't for him taking me in as more than just a vessel, my body would of been his. I would of just been him. But since it didn't come to fruition, I'm technically the king's only failure, a prototype to the ideal of having a body here"

Serafall put a hand on my arm as she looked at me concerned.

Serafall: "Don't talk like that. You aren't a failure"

I smiled and pat her head.

Y/n: "I'm not saying Gilgamesh considered me a failure. I'm sure he loved me like a child like he spoke before. I'm just saying, in technical words, I'm his only failure when it comes to creating something that didn't come true. A prototype"

Michael: "He Who Killed a God?"

Michael said as he read the words near the guard of the sword.

Y/n: "Before we fought Kama, My father mentioned something to me. He wanted me to make a legacy of my own. Using his weapons are cool and all but he said, "Have a weapon that defines who you are". What has been my accomplishments until now?"

I begin to sheath it as I think about everything until now.

Y/n: "I've become a king, but how many have done that?.. I looked further than that. I've united factions by throwing my authority, but how many have done that? As you go further and further, the numbers dwindle but those are accomplishments that have been done"

Sirzechs: "But how many have accomplished all of that themselves?"

Y/n: "I know someone who has.. and he was a great hero. The first hero in fact"

I chuckle to myself as the rest enjoy my sudden happiness from talking about Gilgamesh.

Y/n: "If I could be proud of something? I'd say it isn't the fact that I killed a God level beast, or being king. I'd say it's having been able to save those I love, even if I lost a few"

Serafall noticed something written on the sheath of the sword and read it.

Serafall: "G. T. Y?"

Y/n: "This sword doesn't just embody my accomplishments. This sword is the will of mine to protect those I still have and remember those I've lost. The will to beat even a god if that's what challenges me"

Azazel: "What about the name? Empyrean Musashi"

Michael: "Heavenly Musashi"

Y/n: "I'm not sure, it kinda just flew in my mind"

We reach a door and I open it to find my peerage, along with Rias' and Sona's, having a feast to celebrate.

Y/n: "These are the smiles I'm trying to protect"

Sirzechs: "That's a heavy burden your putting on your shoulders?"

Y/n: "And I'll gladly accept it as Humanity's Overseer"

Serafall: "Then we'll be here to support you"

Azazel: "Gilgamesh and Tiamat left us the duty to make sure you don't fall to the pressure you know? Don't hesitate to rely on us if you need it"

Y/n: ".. Thank you. All of you"

Sirzechs: "Don't mention it"

Michael: "You have Heaven and Hell supporting you"

Mordred: "Master!!!"

Mordred, X, Eucliwood and rest were all waving at me with big smiles to come over. Seeing them so full with joy made me crack my usual tough exterior.

Azazel: "Go on. You deserve to celebrate too"

He pat me on the back with a little push.

Sirzechs: "Even kings celebrate a victory"

Y/n: ".. Right"

I walk over to everyone as they shower me with food to try. I couldn't help getting their contiguous laughs and joy despite Akagi going back to her usual antics, Ophis asking to borrow Ea, Eucliwood sitting on my lap and so on. While normally I would get a little annoyed, I chose to just embrace it for today. Today was their day.

Serafall: "He looks so happy"

Sirzechs: "He earned it like I said.. That being said?"

They group of 4 turn around to see an older man with a mature looking woman right behind him.

Azazel: "Could you not interrupt him right now? He's trying to enjoy his time with the rest"

Odin: "I don't mean to intrude in his private time, I just wished to meet him, that's all"

Azazel: "He ain't available"

Sirzechs: "Easy there Azazel. Odin, it's nice to see you once more. I take it you enjoyed the battle?"

Odin: "It entertained me from start to finish. He and his peerage were wonderful in combat. As I expected, he is truly humanity's strongest"

Sirzechs: "He did kind of proclaimed himself as the Pillar of humanity"

??: "Humanity's king?"

Odin: "Oh, where are my manners? *clears throat* This here is Rossweisse, she's a valkyrie who's accompanied me on my journeys"

She stepped forward with an elegant bow to the 3 faction leaders and Miss Leviathan.

Rossweisse: "Hello there. I am Rossweisse, Valkyrie of Odin. I am pleased and honored to make your acquaintance"