MTL - Don’t Learn Mandarin Ducks - Chapter 6 her weakness

An ordinary student, a wretched peeper, a cowardly teenager with a kind heart. In a terrorist attack, he inherited the knowledge of countless elites, embarked on a path of God Jagged Tu…

He is an artist!

He is a mathematician!

He is a psychology Doctor!

He is a master of fighting!

In fact, he is a man

Taken off raw site:

A wretched, dirty young man is working during the summer when he was caught up in a mysterious explosion. After that explosion, the young man is then left with the memories and knowledge of dozens of the world’s experts.

He has changed, his heart has become cold, iron-blooded. He became a killing machine, his mind turned mechanical, calculative. Everything goes according to his plans and calculations!

In this magical, slaughterous world, a door is opened for him…

- Description from Novelupdates

In a world where power is everything, Lin Tian is reincarnated as a goblin—the lowest of monsters. He starts his journey in the shadows, relying on cunning and wits to survive. But as fate unfolds, he taps into the goblins' true potential, turning the tide of destiny!Blessed by the gods, each child he brings into the world increases his strength exponentially. The Church's Cleric whispers: “He is the only true Lord, the God I must serve.” The undefeated Sword Saintess finds herself humiliated again and again by this little goblin who defies all odds.As the gods watch in horror, they realize: “We will never allow a goblin to become a god!”In a relentless assault on faith itself, Lin Tian's rise marks the beginning of a brutal era where the goblin reigns supreme. He toys with the likes of the Human Race Sword Saint, the Empire's Princess, the fiery Dragon Mother, the elegant Elf Queen, and even the wrathful gods of the Sea and Earth.When the dust settles, all will tremble in fear of this once-humble goblin, the one who turned the heavens upside down and shattered the divine! Embrace the chaos as he rises from the depths, challenging everything in his path to absolute domination!Prepare for an epic saga of dark fantasy, survival, and the audacity of a goblin who dared to take on the gods themselves!

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.