Side story: Gunmir of exploding iron

When number #B2 woke up he also found himself in the stomach of his mother instantly realizing how primitive this planet was. He saw that he was born in a family of dwarves. After living in this world for a month he had understood two things there existed strange powers you could get from dungeons and that this planet had medieval technology. He was also named Gunmir.

He had also begun to train his Transmutation. When was five he had already made a name for himself because of his genius level of intelligence compared to other dwarves his age. He had also begun creating different firearms to protect himself. Of course, he didn't forget to train his body he was already short due to him being a dwarf so balancing wasn't hard he only trained to withstand the recoil of the gun.

When he turned ten he had already become quite resistant for his age both because of his extreme recoil resistance for his age and his short stature. He could now mostly only use small guns such as revolvers but they were still deadly. He had also been drafted into the mines, he like other dwarves worked his ass off.

It took him a while to get used to manual labor due to his having lived in the advanced space era where most tasks were automated. But he already realized that life would be hard so he pushed through. When he turned fifteen he was already ripped and used a handheld cannon. This would be impossible if he was a normal human but due to him having almost no limit to his strength like all the other people in this world he was able to become extremely strong.

He now spent most of his time defending the dwarven kingdom along with other strong dwarves but he was well known for his "magic" that he used that was actually just guns. He killed all his enemies with what the dwarves called exploding iron and instantly killed his enemies. He often compacted his ammunition with Transmutation and made it big when he needed it and otherwise kept it in a bag on his waist.

One time he met a demon berserker searching the area around the dwarven city for any victims but before it could attack he jumped forward by condensing the air beneath his feet and letting him explode forward. Then he took out a handheld cannon and put it in the mouth of the demon while flying forward and blasting the head into a fine mush. He used the recoil to jump back and landed on the ground. Due to this stunt, many dwarves now revered him and followed him.

When he was twenty he had begun to push back the demon forces by using explosives and other weaponry. When he was done pushing back the demons more powerful ones came back forcing him to create better weaponry and push them back. This loop continued until the demon king sent a Demon baron a high-ranking demon that quicky pushed him back and when he was trying to find better methods to push the demons back he attacked city after city.

This continued until the demon baron had destroyed most of the surrounding villages and farms making the dwarves inside the capital starve to death. He was one of the survivors who escaped swearing revenge on the demon king.

After this, his sole purpose was to destroy the demon king creating more and more deadly weapons. When he was thirty he had created a handheld railgun that shot through demons like butter he used this weapon to destroy all the demons in the area. But it was already too late the demons had killed the king making the remaining dwarves go into a civil war.

When he saw this he became even ore wrathful. He started to train to become stronger. When he was thirty-five he realized one thing he couldn't do it alone. So he began searching for the other reincarnated. He was able to find the four other people that had #B on them and two that had a normal #.

He then contacted them right before he was forty and said that they should kill the demon king one and for all. He was able to convince all of them and had them meet.