He's My Fiancée ! : I Went Back To The Past and You ! - Chapter 80 - 75: Imagination Run Wild

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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Lucifer travels to the world of One Piece, binds the system, and obtains the fruit of words and the power of hell demons at the beginning.Everything Lucifer says will become reality, and matter can be summoned or generated through sound.Flash, lightning, fire, ice, magma, gravity, earthquake, all powerful abilities, Lucifer can use.By beheading enemies, Lucifer earns kill points, which buy more powerful powers.Akainu: As soon as Lucifer speaks, my magma can only be used to light candles.Kizaru: As soon as Lucifer opened his mouth, my flash was slower than a turtle.Whitebeard: My Shock Fruit can't shake a rock.Kaido: My immortality has failed.Redhead: Why is my strongest Conqueror's Haki gone?Five Elders: Please, stop talking.Lucifer: I haven't done it yet, why are you so stupid?Everyone: You didn't do anything, but you did.Lucifer: A gentleman uses his mouth but not his hands.From then on, a hell demon who used his mouth to attack invincible opponents all over the world was born.Disclaimer: This is Translation

The main character has been reincarnated, and he possesses a system and a powerful treasure. Using these, he plans to create his own universe. Keep reading to find out more.

Apollo Leone tried to prolong his life as best as he could. But alas, he couldn’t escape the grasp of death. Even with his talent and being the wealthiest person on Earth, he died on a hospital bed. All his money, power, and influence vanished with his last breath.However, fate proved to be playful.Who would have thought there was a place after death that is neither Hell nor Heaven? There, he met a faceless woman named Aster, who granted him a new life on another planet where strength reigns supreme.But on one condition...Wait?! I have to live my life as a beggar?!Known as the most wealthiest person to have ever live and the person at the very top, how will he adjust to this new world where people can summon meteors, punch through mountains, and cut the sea in half?Beggar Cultivation System Activated!“You received 1 Alm Point!”“You received 1 Alm Point!”“You received 1 Alm Point!”......“You received 100 Alm Points!”“Do you want to advance to the next stage?”“Yes!”