The Billionaire's Multiplier System - Chapter 13: The Penthouse Power Move

Question, there is a beauty under the starry sky, her black hair looks like eternal night, her bright eyes shine like stars, her powerful magic power makes the world tremble, and her peerless beauty makes all living beings surrender, who is this beauty?

“That’s right, it’s me, the Witch King, Dorothy”

ps: The real name is “Otaku Witch”, a slow-fire setting text, too watery to enter! Don’t like water! Don’t like water!

- Description from novelbuddy

“I believe that if you have a problem, we just need to solve it with firepower. If the problem isn't solved by then, it just means we weren't using enough firepower.”In a world of swords and magic, Lucen Thornehart, the eldest son of the Iron Duke, was considered the shame of the noble knight bloodline. No talent, weak, and worthless.Until one day, when a fever awoke his previous life's memories and the knowledge of the class from an old game he used to play, Gun Mage.More than just guns, he creates weapons that have never been created in this life and the last.A sword that heats up, turns crimson, and could melt metal.A rune-engraved gun that mages use to amplify their spells.A giant sword that you would only once see in a video game, which makes an explosion every time it hits an enemy.A gun that is powered by mana and shoots out condensed amounts of mana.Airships, steam trains, and boats.Lucen Thornehart isn’t here to play fair. He’s here to redefine warfare, with overwhelming firepower.

When Li Xianyu was 20 years old, he received his father’s inheritance, an 18-year-old great-grandmother who was incredibly beautiful.

Li Xianyu: “Great-Grandma, why are you so young?”

Great-Grandma: “That’s because I died when I was 18 years old.”

When MC was reliving a picture of a goddess, he died. Only meet the goddess, but instead of torturing him to eternity, she gives him wishes. And make him reincarnated in the Overlord world.As the name suggested, this is multiverse Fan fiction, that means MC will travel through different world like Marvel, DC, High School DXD, My vampire Diaries (may be) , Demon Slayer, etc.first world: Overlord (Chapter: 1—60)second World: Highschool DXD (Chapter: 60—215)Third World: Demon Slayer(Chapter: 216—)Fourth World: New World (Overlord)There will be a harem, no NTR or stuff.Some of you might dislike the Yggdrisil arc as it is a bit of AU and MC talk a lot. But it is only in this arc on world travel that I will tone down his unnecessary internal monologue.I am not a professional writer, and I have no deep experience in writing, so please ignore my grammar mistakes and such. I also took some inspiration from other fan fiction.It would be a great help if you could donate your power stone to me.