City of Sin (Yanyu Jiangnan) - Vol 8 Chapter 55

Scheming female assassin transmigrated to become the weak Eldest Miss, her story is wonderful and stunning, attracting peach flowers to blossom open. Cold calculating emperor? Genius bad crown prince? Insidious happy-go-lucky prince? Gentle physician? Ice-cold mystery male? Who is her true love? Haha, but she only eats, definitely will not take responsibility! Beautiful men be careful!

- Description from Novelupdates

In the age of Universal Awakening on the Azure Sphere, a myriad of races and gods coexist.

Devils, dark gods, and monsters descend upon the mortal realm, only to be met by the Awakened.

Howard, during his Awakening Ritual, discovers dual talents— F-rank Mana Recovery, and the supreme talent: Supreme Synthesis.

He keeps a low profile, hiding as a 'common magus.'

Through countless acts of synthesis, he forges supreme artifacts, supreme skills, and supreme classes!

Fireball synthesis... Ding! Synthesis successful, attaining D-rank skill— Fire Serpent!

Fire Serpent synthesis... Ding! Synthesis successful, attaining B-rank skill— Fire Python!

Fire Python synthesis... Ding! Synthesis successful, attaining S-rank skill— Dragonfire!

When devils invade and dark gods descend, they are left slack-jawed by the Azure Sphere before them.

“No, this is a trap... a trap disguised as a mere cupcake!”

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I, the protagonist, was just an ordinary NEET, but suddenly I was reincarnated as a tiny white snake in a fantasy world where legendary creatures and gods exist. Not only that, but I awakened in a cave as the offspring of a terrifying Medusa Serpent.Armed with only my human knowledge and my indomitable mental strength, I'm forced to use cunning tactics and rapidly evolving skills to survive against far stronger monsters and humans... So begins the survival story of a former shut-in with incredible willpower, living as one of the lowest-ranked beasts in a world of magic!ᆖMusic suddenly started playing in my head.I'd been waiting for this moment for so long.'Snakes! Assemble'....

What happens when a scientist from a futuristic world reincarnates in a World of Magic and Knights? An awesome MC is what happens! A scientist’s goal is to explore the secrets of the universe, and this is exactly what Leylin sets out to do when he is reincarnated. Dark, cold and calculating, he makes use of all his resources as he sets off on his adventures to meet his goal. Face? Who needs that… Hmmm… that guy seems too powerful for me to take on now… I better keep a low profile for now. You want me to help you? Sure… but what benefit can I get out of it? Nothing? Bye. Hmmm… that guy looks like he might cause me problems in the future. Should I let him off for now and let him grow into someone that can threaten me….. Nahhh. *kill*-

Alternative: Leylin is transported from an advanced technological era into a medieval world— except there’s magic. Equipped with “only” his quick wits and an A.I. chip fused to his soul, he sets out to become the most powerful magus the world has ever known. In a land divided into the Light and Dark Magi, the weak can either be cattle or disposable slaves. Only the strong can determine their lives, and only they have the luxury for virtue. Yet strength is only a tool for Leylin, like any other. His goal, in the end, is his own.