Demon King & Hero - Chapter 7-3: Haaaah… I don’t even know.

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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[Warning!!! Contains Explicit Scenes, extreme gore, heart-pounding fight scenes, and a combat loving MC!]Two centuries ago, Earth underwent an earth-shattering change.The gods were slaughtered by an unknown terrifying existence, and their potent blood spilled through the entire solar system, corrupting all life on various planets along with Earth.As a last resort, the gods created the Galactic Tower. Their inheritances, strength, and relics were placed as rewards for those who cleared each floor, proving themselves worthy.Thus, the Awakening Era arrived.…Lucian Morningster, the golden boy of the city. He had a perfect life, had the prettiest girl, a good best friend and a very bright future.Noticing his potential, The Mayor took him in, everyone respected him, his classmates envied him and the Mayor took him as a son.However, everything ended when he awakened an F-rank talent instead of the S-rank talent everyone thought he would awaken.Lucian’s smile froze. He mumbled to himself, “It must be a mistake?”The whispers started again. This time they weren’t nice or joyful; no, they were sharper and carried a cruel edge.“See? I told you he would awaken a trash talent.”“All that potential, for an F-ranker?”His girlfriend who awakened a C-rank talent, “What a waste, Lucian. My father took you in for nothing,” Her voice as cold as the ice on the tips of her fingers.His best-friend who awakened an A-rank talent, “You know, seeing you so weak and vulnerable is kind of refreshing. She always hated your endless confidence, so do I. It’s no wonder she comes to me after being done with you.”Lucian, who was respected and envied now turned to a joke to the entire school and town.“Boom!”Those who he called friends attacked him, leaving him for dead in the Galactic Tower.It was then his chance for vengeance arrived.[Ding!][Would you like to Reroll your talent?][Congratulations! 100,000x Reroll has been triggered!][Self Regeneration (F-Rank) has evolved into Ungodly Regeneration (SSS-Rank)!]────────────────────────[Ungodly Regeneration]▪ Class Rank: SSS▪ Class Perk:— +∞% Vitality | +300% Mana (SSS)▪ Class Skills:➤ (SSS) Ungodly Regeneration: Instantly regenerates from any injury. [Upgradable]➤ (SSS) Blood Shadow: Use your blood to awaken a blood shadow of slain enemies. [Upgradable]➤ (SSS) Blood Extraction: Absorb the blood of the dead to gain random stat enhancements. [Upgradable]────────────────────────[Rerolling Standard Combat Spear...][1,876x Reroll has been triggered!] [Standard Combat Spear → Blood Shadow Devourer(Legendary)]────────────────────────[Rerolling Mana Sorage Necklace[Bronze-grade).][5000x Reroll has been triggered!] [Mana Sorage Necklace[Bronze-grade)→Celestial Essence Amulet (Mythic-grade)]────────────────────────[Rerolling Tresure Chest[Bronze-grade).][5000x Reroll has been triggered!] [Treaure Chest[Bronze-grade)→Treasure Chest (Mythic-grade)]•••With extraordinary power: comes extraordinary responsibilities.Lucian: “Fvck that! I just want vengeance!”

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

The most feared Assassin in the world died because of vengeance.