Harry Potter: Dimensional Wizard - Chapter 15: Savior

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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“Breaking News! A 28-year-old IT worker beats three university kids to death with a spiked bat over a dog!”Abandoned at birth, and named John Wicked, he suffered a life of solitude and harshness. His only companion was a dog named Alfred who was with him since he was 8 years old.Alas, on his 28th birthday when he was returning home from the company with a gift for Alfred, what awaited him was three university students beating his dog senseless--the reason being that Alfred barked at them.They escaped after beating him, too, but John Wicked lost his only family there as the sky broke into tears as if weeping alongside John, holding his dear companion's lifeless body.After getting revenge and being put on death row, John Wicked felt no regret for his actions, and the public also didn't support him.If the world didn't understand him, he didn't need to understand the world. He took his own life because he didn't want to die by the so-called justice of this world.But that wasn't the end. That was the beginning of John's new life after making a deal with an Eldritch God.Join John and Alfred's journey in the fantasy world where humans tame monsters and live an intricately connected life.

In the early world of immortal cultivation, there was no physical cultivation among immortal cultivators. And a top bodybuilder who came from the earth has opened up a new path here and became the ancestor of physical training.

- Description from novelbuddy

Rael screwed up badly. One reckless gamble later, and his guild's entire emergency fund was gone. With debt collectors ready to harvest his organs, his only hope was a single, desperate gacha pull.Ding![Congratulations! Player: Quarterpounder69 has obtained the (Divine) Grade item, Eye of the Beast!][Divine Grade item obtained! All Stats +250][First Divine Grade item obtained! All Stats +100][New title unlocked! [Heavenly Attraction] (Divine)]With no other choice, he consumed the item—only to be thrown into a situation no player had ever faced before.[To ensure fairness, please select a random number. This will determine which boss monster variation you become.]'Uh, I don't fucking know? 69... hmm, maybe not...'[Confirmed.]'Wait—'[Congratulations! You've chosen the Special-Type Boss Monster Variation: The Pay-to-Win Boss.][Congratulations! You've become a Boss Monster!]Armed with broken perks like [Premium Leveling], [Premium Evolution], and [Premium Shop], Rael was thrust into the world of the VRMMORPG game he had been playing.The issue was, he went back in time, specifically, 150 days before the launch of version 1.0.