A/N: Just a concept chapter for now, as I have lots of other stories to finish, both fanfiction and professional novels. But I've been reading DanMachi fanfiction recently, and thought, why not? If/when I do more chapters; it'll probably be a bunch of self-contained scenarios involving the cast and my OC, as otherwise the story would run too long, and we've all seen the anime or read the story.

Is it wrong to try to pick up Girls in a Dungeon with my scary senpai?

Grey Faction x DanMachi Crossover

Part 1 – weapon breaker

The monsters once again surged towards him, at least a hundred of them, all massive, snarling, clawed, dripping poison, and savagely hungry. Their target grinned, his grey eyes flashing golden, as he met their charge with guttural laughter, showing no fear of the Varanus, the eight foot tall lizard monsters that killed many on the 37th floor. They didn't rely on strength, though they had it in abundance as level 3 monsters. They were cunning, they hid, ambushed, fought in groups, left reserve forces.

Most solo adventurers died on their first encounter with a Varanus, because they never, ever hunted alone. They were not above waiting until an adventurer stooped to pick up the dropped crystals or item drops of another monster before attacking, and one bite paralysed you in seconds. So unless you fought them with an antidote in hand or had high status resistance, you were done. Even so the young man they faced showed no fear, only exhilaration as he bisects the nearest Varanus from groin to head. He wielded a pole axe, a long metal pole with an axe head at its end, this weapon was ideal for multiple opponents, had a heavy end for striking and cutting, and the same versatility as a staff, though much heavier.

He danced among them, twirling it like a baton with deadly accuracy. When surrounded, he pole vaulted to safety, laughing gaily. But as always, as it always ended, as around the 92nd bisecting slash, the axe blade finally shattered from the constant heavy use. Varanus hide was tough, especially when using mundane weapons. The young man always broke his weapons when dungeon crawling. He used them harder than needed, insisting on a one swing – one kill whenever possible.

"Fuck!" the young man cursed with irritation, the forging goddess, Hephaestus had made it for him, and it wasn't cheap, and she always bitched about his poor treatment of her familia's weapons and equipment. Which is why he usually used inferior, mass produced iron or steel weapons from regular blacksmiths, but he always kept a few quality blades on his person for stronger foes, or unexpected situations, such as him walking into this floor moments prior to surge of new births from the dungeon's walls.

The few surviving Varanus lunged at him, the first got impaled, mouth first on the pole of the broken weapon, turning the monster into something out of horror porn. Thankfully it died very quickly, leaving a crystal, which could be cashed in for money, along with a fist sized, squishy purple ball, which when boiled, popped, and the poison could be extracted. The young man when not selling it on, would instead coat his throwing weapons with it. He didn't bother to pick them up yet though. Reaching into his adventurer's coat, he drew a single short sword; it was all silver blessed steel, nigh-unbreakable, but it required a great deal of maintenance to keep its edge. He seldom used it, but his lesser swords had broken on the way down to this level.

"Come on monsters!" the young man laughed manically, a white aura flickering around him, which despite being an aura of purity, carried a fierce predation with it. "Can you kill me?" he asked, eyes alight with the possibility.

They growled and attacked!

He dodged their claws and poison fangs with inches to spare, and in a blur of movement removed their heads, seemingly all at once.

The young man took several deep breaths, checking his surroundings, all dead. He sighed, disappointed, it was over too quickly, and he lacked the equipment at present to go deeper. "So I failed to die again…" Another sigh, time for a long trek back up the floors, most of the floors wouldn't have re-spawned yet, but it would be time consuming nevertheless. If he used his sword exclusively it would be blunt long before he made it back to the surface. Fortunately the floors often had the weapons of dead adventurer's.

Unlike most, he had no qualms about stealing from the dead, or those monsters who used equipment which they had taken from adventurers. Apparently he was something of an oddity in that regard, no respect for the dead, and no respect for ones weapons, as who could rely on rusty, possibly damaged weapons. Only the desperate, and him did it, he always broke his weapons anyway, so he wasn't picky.

"But I suppose I should collect all of these," he sighed, regarding the hundred or so crystals scattered about, and the occasional monster-part drop. But at least he didn't need to carry loads of excess weight or hire someone as a pack-mule to do it for him. As a general rule he only worked solo, but thanks to his skill Dark Store, a unique support ability which allowed him access to a small space pocket, about the size of a small room, he avoided a lot of the usual struggles.

The Dark Store was sadly empty of weapons now, but pretty full of the crystals and monster drops. The young man extended a palm, showing an ugly black scar, and from it seeped a black liquid, forming a dense black bubble on his palm. It shot forth like a KI attack, collecting all the crystals and item drops, upon finishing, it snapped back like a bungee cord, before vanishing back into the scar.

"Well time to get home; don't want Hestia to give me any crap for being gone so long."

The young man's name was Mark, though he went by Dingir within the dungeon, a reference to his former life. It meant both angel and god; and it irritated Sumerian Gods. However he did serve an Elder god, so the angel part worked…rather ridiculously well if one were to know his past and bloodline, though if one were to meet his deity, they certainly wouldn't believe that Hestia was the sister of Zeus, Poseidon, and Hades from Greek mythos.

As the young adventurer, now known to us as 'Mark' or 'Dingir' climbed through the many floors of the dungeon back to the relative safety of 'outside' we now take a moment to describe him. He is rather tall, 186cm, a little over 6ft for everyone else, and somewhat pale from spending most daylight hours in the dungeon. He had dark brown hair that verged on being black, though he had a little tuff of white hair in the back, which Hestia thought was cute, much to his annoyance. Grey Eyes that were flecked with blue and yellow, and these steely eyes when combined by the shadows of a deep brow gave him an intimidating gaze, whether he wanted to do so or not.

Dingir wore all black clothing, with Mythril chainmail secretly sewed beneath the material, in-between two layers of coloured cotton as a precaution, or to stop a dagger or claw in the dark. Over that he wore a hooded coat, modified from mages robes design – opened at the front, and made from black orochi skin, absurdly expensive normally, but he had hunted one himself on level 49. It had damn near killed him, and he barely managed to fit the skin in his storage skill. He'd actually been forced to hire the aid of another group of adventurer's to get back, when he encountered them on their own return to the surface.

The green haired elf never let him hear the end of it on the trip back. However now he had a stylish coat that was force, cut, and heat resistant, he also wore bracers on his arms, in case he ever had to guard, as a shield was too heavy and impractical for long use. His boots and legs up to the knee were similarly armoured with black plating. All the metals were light weight, as Dingir favoured dodging over blocking. All in all, he looked rather badass in his chosen adventurer garb, or at least or thought so, the other adventurers found him intimidating and cut him a wide berth, as they all knew him by sight and reputation.

Mark (aka Dingir) commonly known as the mad adventurer, or Hestia's monster, and arguably one of the strongest level 5's in the city. The fastest to get to the rank in living (mortal) memory, and the second deepest solo explorer of the dungeon, losing only to Ottar, who was a level 7, and as such had little to fear prior to the deeper floors, which required armies to fight through. Dingir was a level 5, and as such was deemed crazy at best and suicidal at worst for almost always soloing the dungeon, even if level 5's were considered the elite.

Both would be correct.

To be continued in part 2...

A/N: by the way, the Varanus is one of my original monsters, which appears in my light novel; 'Who summons a demon lord candidate to save a kingdom?'

Recommended books/light novels, and comics by me

Grey Faction: Arrival of the Grey Queen

Grey Faction: Mistaken Apostles

Grey Faction comic: Jinhai's Justice 2018

Grey Faction comic: School Wars Manga

Grey Faction comic: Arrival of the Grey Queen

Detective Michael: The Scalpel Murder

Detective Michael: Riverside Mystery

Detective Michael Comic: Scalpel & the Hunt

Vampire Attack: Empire of Shadows

Vampire Attack: Shadow Force

Secret Yuuki & the Guilty Heart Chronicles: Dimension Wars

Secret Yuuki & the Guilty Heart Chronicles: Starlight Alliance