I used Repetition to kill all the skeletons in the first floor of Nifonium, and then used Infinite Recovery Bullets to recover MP as soon as I got rid of them, and then proceeded through the dungeon.
　Normally I'd do this and that, but I used a combination of Repetition and Infinite Recovery to keep the weapons I had on hand for the duration of the dungeon.

　I soon came across it(...).

　It is humanoid, with a head, torso and limbs, and is an adult male in size.
　It had no eyes, nose, or mouth, and was smooth and smooth, with no ups and downs, and weird patterns swirling all over its body, in such a humanoid shape.

"It looks like Jupiter: ......

　I couldn't help but say it out loud.
　It was a Jupiter-like pattern I saw in a textbook a long time ago.
　It looked just like that Jupiter photo cut out in human form, and I felt like I was going to get drunk just looking at it, and I was going to get sick.

　The guy slithered on. He reached out to a nearby skeleton.
　The skeleton that touched his hand was eaten (、、、、).

　Like an eraser, the skeleton's body disappeared as the hand passed through it, and the remaining bones fell to the ground in a flurry.

　There was no time to be astonished, a new skeleton was born from the wall right next to that guy.
　A hole was made in the wall and a skeleton was born from it in a blur.
　The humanoid thing stretched out its arms again, and this time it erased (ate) the skeleton from the entire wall.

　The Grand Eater, also known as the Dungeon Eater.
　Immediately, I felt like I understood the reason for that name.
　A monster that erases anything it touches like an eraser?

'First of all, try ...... small hand!

　I fired a series of normal bullets from two guns, and fired a total of six penetrating rounds at him on a trajectory that fused them together.
　The air is torn and the penetrating rounds fly through the air, and the bullets fail to respond to the speed or they land on the ground eater.

　And then it disappeared.
　It literally disappeared. The moment the bullet hit the Grand Eater's body, it disappeared just like the skeleton before.

''Then!

　He quickly swapped bullets, and this time he loaded frozen bullets, fire bullets, and infinite lightning bullets.
　If the physical bullets are no good, this time he fires a series of magic bullets of the attribute on both sides.

　The bullets are launched to land, expanding the magic circle--.

What!

　It was the most surprising thing I've seen since I started using this gun.
　Frozen bullets were eaten by ice, flame bullets by flames, and lightning bolts rained down from the ceiling, all of which were eaten by the Grand Eater.
　Not only the actual ice, but the flames, the lightning, and even the magic circle that spawned them were eaten by anything that touched the Grand Eater's body.
　It wasn't just matter, it was shocking that even the magic circle was eaten.

　Does the Grand Eater have the power to erase everything that touched that body surface of the Grand Eater, that pattern like Jupiter?

　Suddenly, he reminds me of the dungeon master of Nihonium.
　A ghostly guy with an invisible body.

　It's a monster, so I should be able to defeat it, and since it was turned into something haggard and sent here, there's a way to defeat it.
　Then I'll use a tracking device that aims at the weakest point, like I did with that one.

!

　I quickly jumped sideways.
　The moment I fired the tracking rounds, the Grand Eater rushed towards me.
　If it were even a half a second too late, it would have obliterated us.

　It cleaved its arm and ate away the tracking rounds.
　It was horrifying.

　I don't mean getting hit by a tracking round.
　I knew when the arm brushed the tip of my nose as it dodged a bullet.

　It ate everything.
　Literally everything.

　It's not just the bullets, it's the air in there, it feels like it's eating away at space.
　I land, sweat pouring down my back.

　The Grand Eater, which eats up everything, didn't chase me.
　I wave my hand carelessly at the wall of the dungeon, which is closer than me, and make it disappear.

　He's making things disappear there in a handful of ways.

　If I let it go, the dungeon - I'm getting more and more horrified.
　I've got to stop it....... I'm going to launch a series of bullets that I haven't used yet.

　Restraint bullets, sleep bullets, recovery bullets .......
　I shot every bullet I had on hand, but they were all eaten.

　But they were all eaten.
　The rope of light from the restraint bullets, the effect of the sleep bullets, and the healing light of the recovery bullets.
　All of them touched the Grand Eater's body, were eaten and disappeared.
　The only thing that didn't get eaten was the scrap bullets, ironically, the bullet speed was too slow to reach the Grandmaster and therefore didn't get eaten.

　Put the gun away, now the magic.
　The repetition doesn't work, of course, and I shot the wind cutter and all the other magic I remembered one after another.

　The result was more and more shivering.
　The reason is that they were eaten as well as the magicians of the special bullets.

　Even the magic is eaten, it is erased.

'Then how about this ......!

　I picked up the bones of the Grand Eater's eating husk, which had fallen at my feet.
　A skeleton femur, I picked it up and used the stone of absolute rock.
　The moment you use it, the rock transforms into a harder stone than anything else, and the effect is applied to what you're wearing.
　The bones of the skeleton holding it also became hard - invincible mode hard.
　I approach with it and swing it down at the Grand Eater.

　While in invincibility mode, both speed and strength drop to the equivalent of F. But the grand eater received the bone without dodging it.

　The result - exactly the same.
　The bones in invincible mode were also eaten and turned into miserable pieces to look at.

　The Grand Eater fires back, managed to avoid it while in invincible mode, but it was still grazed in the waist.

　One of the guns was taken, it was eaten.

'd*mn!'

　Desperately retreating, getting distance.
　If we stay that close, we're going to get killed.
　Even in invincible mode, even with SS strength and HP.

　I've become convinced that the Grand Eater will eat them out regardless.

　The Grand Eaters didn't follow. They ate away at the walls of the nearby dungeon more than I did away from them.
　I'm not in mortal danger, but the pinch continues.
　If I let it go, it will kill the dungeon.

　Dungeon Eater, I now realize the horror of that nickname.

　What do we do now?　How do we get it down?

　There's definitely a way to beat it.
　The only reason this guy is here now is because someone beat him and brought in the drop and made him into a haggle.
　There's definitely a way to beat it. There's a way to beat it.

　What is it?

　The dungeon eater waved his arms.
　A gesture that was almost human for a moment, a gesture that seemed to shake off the flies that were coming at it.
　It was the scrap bullets that he swept away (and erased).
　He fired the first shot, and only now shook off the scrap bullets that had arrived so close.

''--!

　A revelation comes down.
　I pulled out the other gun I had left.
　I pulled out all the bullets I had loaded and replaced them with all the scrap bullets I could find.

　I fired the scrap bullets.
　Fired one shot, took a step back.
　Shoot, step back. Shoot, step back.

　Keep shooting, keep dropping back - and go towards the dungeon's exit.
　After we left the dungeon, I continued to shoot the scrap bullets.

　With every step I took, the scrap bullets I hit, that thing crawled through the air - it was like a rail.

　There's a sign, a sign of a grand eater.
　From inside the dungeon, that thing came.

　He came waving his arms and eating scrap bullets as if he were wiping out flies.
　He waved his arms and took a step forward. Wave your arm and take a step forward.

　Chasing the scrap bullets like rails, the Grand Eater disappeared the moment we left the dungeon.

　No matter how strong he was, he was capable of erasing anything.
　The monsters of the world would disappear the moment they crossed the threshold of the dungeon.

　It was no exception in Grand Eater.
　Lured by the scrap bullets, the Grand Eater disappeared cleanly under the open sky.