As I approached the mansion, a certain girl was cleaning the garden in front of me as I recognized the newbie maid of the mansion, Petra. I waved to her, and it seems like she didn't recognize me, because she immediately ran inside to get Frederica.

Exasperated at the girl's action, I sighed as I advanced onto the entrance, where a quart-human was comforting the child.

"Welcome, Y/N-san. I didn't know that you were coming back recently." Frederica said, as her eyes drifted towards the swords on my back.

"Hello, Frederica. I received news that the mansion will be attacked in two days, so I came back to set things right. Subaru and Emilia has a plan against another threat in the Sanctuary, so I'm here to take care of the mansion."

"Attacked? Really? By whom?"

"Two of top assassins of the Assassination Organization. A mabeast user and the Bowel Hunter. They are extremely tough enemies, so I had to come back."

"How do you plan to fight them? I've heard of the Bowel Hunter, and she seems to be an extremely tricky opponent to deal with."

"Don't worry. I have a plan when the time comes, but first we must evacuate the village into a shelter that I'll create. With the village out of their plan, they'll come straight here. After that, you need run away with Petra while I deal with Elsa and Meili. Also, please take Rem to a safe place today sometime as well."

"Are you sure that your plan will work?" Frederica asked me, unsure about my credibility. However, I had full confidence my own planning, as well as Echidna's advice, and so I nodded.

Timeskippu*

After evacuating the villagers into my diamond shelter along with food they prepared, we also transported Rem into a different shelter, one that Petra and Frederica would escape to during the attack. I knew where Elsa would come in from, and so I installed an aluminum wire at the place where she'll meet Frederica, alerting me at the exact moment to fight.

Now that everything is prepared for tomorrow, the Feuernacht, when Elsa will attack. Besides from doing my daily exercises, I taught Petra a little running and dodging while doing exercises with a wooden stick. Echidna popped in just as I cut a tiny stump in have with my one of my swords.

Hey, Y/N, could I talk to you for a moment?

Ya? Chid-chan, did you have something to say?

Why are you calling me Chid-chan? It makes me feel like as if I was supposed to be cute or something.

Well... you kinda are, in a sense, so...

Ugh! Fine... anyways, I'm here to remind you that you missed something while you're preparing.

I missed something? But I thought you taught me everything, did you not?

I'm not talking about magic or Authorities. The objects in question are those on your back.

My... back? Oh, right! My swords! I said as I unsheathed the Shadow Sword and the Spirit Sword. Um... what exactly am I supposed to do with them?

Well, from what I know, the Shadow Sword is Bayanga's private property, so she might have an idea on how to use it. As for the Spirit Sword, I think one of its passive abilities is to decrease the stamina drain of one who has spirits, and the amount of stamina decreased per consumption increases with each spirit you possess. I also know that the Spirit Sword will give a huge boost in the effectiveness of Spirit Magic, which will give you an advantage to the curse doll.

Well, how exactly do I develop them?

A sword always has its abilities. Refer to its name. Sorry, Y/N, that's all the help I could give you. I have to go oversee the trial of that insufferable girl.

Be honest, Chid-chan. Are you scared of Emilia?

...

You are, aren't you-

Y/N. We will not speak of this again, understand?

*shivering* Hai, hai, sensei...

With that, I cut off the communication, and took off into the forest where the demon beasts resided. I managed to find a few Ulgarms roaming around, perfect for my practicing. I jumped into the clearing, and they came towards me as I held my sword behind my back as I gathered Yin Magic as I let it flow through this sword.

Hmm... why am I in this stance?

Who does this remind me of?

Ah... I see. Thank you for enlightening me. The familiar green haired woman flashed into my mind as I smiled. "Crusch! I'm going to improvise on your ability now!"

May darkness seep into your soul.

May the abyss engulf you.

May my slash corrode the existence of thou.

Shadow Sword, from now on, your name is Inen. Be the void that will erase enemies in my path!

"Inen Original- Kurayami no Hitotachi"

I turned as my feet rotated and I spun, and unleashed the wave of Yin Magic as Inen cut forth, splitting the mabeast dogs in two as the attack's magic wave slashed the rock behind it, and I saw an interesting effect take place. Although the magic wave itself did not do much, within moments, it corroded and the darkness consumed the stone in respect to the width of the sword.

"Ha! That's actually quite interesting. Now, to test you out, Ryokyo, the Spirit Sword!"

I yelled as I charged at the remaining mabeasts, lining them up into a straight line as I reeled my left hand back, and allowed Cahya, Alchemis, and Bayanga's energy flow into the sword itself.

"Prismatic Spectrum, pierce them."

The rays of light shot out, similar to Julius's Al Clarista, and completely disintegrated the mabeasts. I unsheathed both swords, happy with my new discovery. I can't wait to brag to Echidna, but there's something else I need to do. Unlocking more elements.

Right now, I have phosphorus and sulfur unlocked due to the last few loops, but what I need right now is calcium, since it'll come in handy for the next phase of my plan after the Sanctuary Arc.

I started my long haul of creating coal from sulfur and carbon, since it is quite a reliable fuel source due its flammability. I also crafted some matchboxes with red phosphorus, in order to make matches for later, which requires potassium and chlorine.

After a while of crafting, I finally unlocked Chlorine, Argon, Potassium, and Calcium. These four are extremely useful, as chlorine can be used to make fresh pool water and salt. Argon is the last missing component to making atmospheric air. Potassium is important for treatment and making soap, while Calcium can construct bones, the last part I need to make bone cells.

Why make bone cells? Hehe... that is part of the fulfillment to the Witches of Sin.

With my new arsenal ready, I returned to the mansion and checked all the traps, and waited for the assassins to show up.

Timeskippu*

3rd Person POV

The demi-human maid walked through the mansion as she patrolled it, avoiding all the strings that her ally has set up. As she went into a hallway and walked to its middle when she heard a sound. The sound of aluminum wires that were laid by her ally being triggered.

Of course, despite having keen ears, the Bowel Hunter made no notice of the wires as she dismissed the traps that seemed to do nothing as she advanced at the demi-human maid. What she didn't know was, the wires allowed the dangerous one to sense her location.

"I've never seen a demi-human's insides before. You'll do well to entertain me!" Elsa said as she rushed towards the demi-human, only to be blocked by a diamond wall that suddenly emerged from the ground and shattered one of her blades.

"Hmm?" The Bowel Hunter experienced confusion for the first time as she looked at the crystalline substance, before a woosh in the air was heard as a boy's laugh and arrows made of boron shot at her, and she quickly deflected the arrows using needles.

"Not bad, not bad. Although I expected the Bowel Hunter to do better than this." The mysterious boy with black hair landed beside the yellow haired maid, and instructed her to hide in the shelter before facing the notorious assassin.

"Oh?! It's you... entertain me this time well, will you?" Elsa smiled, as one of her juiciest prey has just offered himself up.

"Of course. I don't plan on losing, after all." The boy said as he formed two katanas made of diamond, and charged towards the Bowel Hunter at extreme speeds, having been enhanced with El Akra.

"El Shamak!" The boy yelled as thick yin magic smoke blowed out from his body, covering the hallway in an impenetrable smokescreen. While the Bowel Hunter looked around for her prey warily, the boy was already behind her as he pointed his hand at the assassin.

"Minya!" The blades of yin fire formed as they zoomed towards Elsa, and one of them hit her as her hands crumbled. However, much to the boy's surprise (or so she thought), they regenerated quickly in the blink of an eye, and she took out her spare kukri knives before engaging the boy head on in combat.

However, the boy had no intention of doing so, at least for the time being. He rushed into a room, and Elsa followed him quickly but ended up getting thrown into a pool of water as the sodium poured in, creating tiny explosions as the Bowel Hunter struggled to realize what was going on. Magnesium was also combusted near the pool of water, and Elsa immediately leapt away despite still being burnt.

Taking advantage of the smoke and magic traps installed in the room, the boy leapt away from the room as he bumped into two people he definitely did not expect to see: The Shield of the Sanctuary, Garfiel, and Natsuki Subaru.

"Y/N! How are you doing?" Subaru asked in relief as Y/N smiled back, and the two enjoyed a bro hug moment before he filled them in on the current situation.

"...since Frederica is already out there, I think you should be help her, Garfiel. There's a mabeast user out there, and since you'll be on the ground, your divine protection would be a great help."

"Hm. Wha'cha think, Cap'n?" Garfiel asked Subaru, seeking for his new senior's opinion.

"Go along with Y/N's plan. He's quite smart, despite how he looks."

"Ok, got'cha." Garfiel then jumped out of the window, and Y/N seemed a little peeved about Subaru's statement, but he brushed that off as he patted his friend's shoulder.

"Go rescue Beatrice now, okay? I know you can do it." Y/N said as Subaru gave him a thumbs up, before running off to find the Great Spirit. At the same time, the Bowel Hunter finally fought off all the traps as she regarded Y/N with interest.

"You really are an interesting fellow, are you not? Besides from the Sword Saint, nobody could do this much damage to me. Well, let me do my part in this entertaining fight as well." Elsa said as she suddenly rushed forward at maximum speed, and knocked Y/N out of the window as the two of them dropped into the sea of flames below.

The boy and the assassin both landed safely, and the heated battle continued.

The assassin stepped into the boy's trap as she realized tiny lumps of black material surrounded her in the shape of rings, surprising her. However, before she could jump back, the boy lit the coal rings on fire using Spirit Magic, and she yelled in agony before coming out, burned.

Although the regeneration was slow, she recovered, but not before the boy surrounded her with bones as they enclosed her, and she was forced to take out her treasured knives as she slashed through the bones, breaking the prison of calcium in an instant.

Seeing how the Bowel Hunter unsheathed her prized blades, the white kukri and the black kukri, Y/N unsheathed his weapons as well. Inen and Ryokyo, the Shadow Sword and the Spirit Sword, gleamed brightly in front of the fire as the two introduced themselves.

"Assassination Organization, the Bowel Hunter, Elsa Granhiert."

"Witches' Sanctum, the Warlock representing Deceit and Sloth, Y/N L/N."

Authority(ies):

Authority of Deceit (Commonly known as Authority of Elements):

-Vacuum Trigger: An innate ability stored within the tesseract-shaped Deceit Witch Factor, allowing the user to spring themselves from unconsciousness when the mana fluctuations around them changes drastically, as a built-in self-defence mechanism of the body.

-Critical Overload: A mysterious ability that protects the user of the Deceit Witch Factor, causing them to unlock their true potential while their actions are coordinated by ?, helping them avoid certain death. This ability only triggers when the user is about to die and has a 15 minute cooldown.

- Haywire Warp: A variation of Critical Overload that allows the user to warp the attack that will kill them, creating a tear in space-time to absorb the attack. Meanwhile, the abilities of the elements are unleashed and they will defy the chemical laws before the user decides to cancel their existence.

-Decagenso Rupture: A variation of Critical Overload that allows the user to combine ten elements into one attack, fusing them into a substance unable to be defined by chemical laws. Then, the substance explodes from the inside to spread parts of itself into the opponent's body, replacing their atoms with the substance itself.

-Pure Truth: Y/N's knowledge of the future. Although he claims that he can only know up to a certain amount, it is only a cover-up to avoid suspicion. This ability also allows him to lie without being detected (e.g. Crusch's divine protection), as long as it is part of his knowledge of this world's future.

-Veritas Oneiro Chunyu: The 'Truth Dream Injection'. A sub-ability of Pure Truth that allows the user to show others fragments of Pure Truth to get a better understanding of a situation or past. This ability cannot show the future.

-'Suitoru': A magic spell that allows the user to absorb a certain ? of the enemy, making it their own and can be stored for later usage.

-Partial Authority Immunity: Y/N is fully immune to some authorities, while some still have a diminished effect on him.

-Scindo: The ability to split the Deceit Witch Factor into pieces to implant them in others, but the pieces can only be taken back a year later. Current Percentages: Y/N L/N: 99.997%, Crusch Karsten: 0.003%

Authority of Sloth:

-Imperceptible Extensions: Y/N's authority also somehow manifested almost the same way as Betelgeuse's did. When activated, two invisible hands can be summoned to be moved around telekinetically. Penalty: If a person is not considered as Y/N's enemy, they will see the extensions. However, another holder of Sloth will also see the hands, regardless of the previous statement.

Elemental Masteries: Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium, Calcium

Spirits: Alchemis- fire spirit (Elder Spirit, devil), Cahya- yang spirit (Great Spirit, fairy), Bayanga- yin spirit (Great Spirit, succubus)

Magic Spells:

Goa- shoots a small ball of fire from the tip of the user's index finger when imbued with mana.

El Goa- manifests three fireballs around the user, and shoots them towards the opponent at high speeds.

Ul Goa- The user fires a large amount of powerful fire bullets. A powerful flame scatters when the bullets land.

Al Goa- The user lets loose a massive fireball, scorching away everything in its path. The bigger the caster's skill, the fireball hotter and bigger the fireball.

Ol Goa-the user concentrates by making a giant fireball, before compressing it to insane densities, and shoots out the beam of fire from their palms

Il Goa- Al Goa, but the user applies a homing technique to the spell itself

Al Huma- The user creates a sharp ten meter long spear of ice.

Absolute Zero- The user creates a vacuum in an area, by freezing the atmosphere to an absurd degree. By doing so, even time will freeze inside of that vacuum and no one is capable of escaping it unharmed.

Akra- A yang magic spell that allows users to enhance their physical abilities as well as sharpen their senses.

El Akra- A yang magic spell that allows the user to move extremely fast, almost becoming one with wind as they fill the user with mana in their nerves, muscles, bones, and veins. This technique is able to match Felt's Divine Protection of Wind

Ul Akra- A yang magic spell that greatly boosts the user's speed and strength, allowing them to travel near the speed of sound and being almost invisible to the naked eye when moving.

?-?

Jiwald- fires heat rays from the user's fingers.

El Jiwald- The user fires several rays from their fingers which are then brought down in a claw-like motion.

?-?

Shamak: The target becomes unable to sense where they are, however they can still feel the ground and sense what's happening to their body.

El Shamak: The target becomes unable to control their bodies while under its effects.

Minya: Magic that creates stakes made of crystallized mana covered with light purple flames. They are strong enough to penetrate defences. Any stakes in the air explode and release smaller stakes that fly in all directions which then rips targets apart.

?-?

Murak: The user reduces the effects of gravity. Just by lightly pushing yourself off the ground, a person can jump as if they had springs. If the user wishes to, it can also be used to fly, although the user will get blown around by the wind like a leaf, but they won't flip around in mid-air.

Vita: The user casts this spell to amplify the effects of gravity, making an object heavier.

?-?

Kilat- The user gathers lightning on their fist/ weapon, and slams it down at the opponent, creating a giant electric arc to shock and paralyze enemies.

El Kilat: The user uses lightning to spread it throughout their body, increasing their reaction speed and movement speed. The user also coats themselves in a thin layer of thunder, able to direct electrical shocks into any opponent they attack.