Beast Slayer Online: Initialization [Volume 1]

SYSTEM ONLINE.

BIOLOGICAL EVOLUTION PATH DETECTED.

One Witcher is a hunter. One Astartes is a god of war. With a system inside his mind, Lannor intends to become both.

Thrown from modern Earth into a brutal medieval world, Lannor becomes the unwilling apprentice of Bordon, an emotionless Bear School Witcher who sees him as nothing more than cheap bait. His first lesson is simple: walk into the poisoned fog, draw out the monster, and try not to die.

But Lannor is not alone inside his own mind.

A Biological Intelligence Core has fused with his brain. The system does not offer random stat points. It offers something far more dangerous: certainty.

It analyzes every sword stroke, Sign, potion, monster, and wound. It creates optimized training plans, tracks skill mastery, guides combat decisions, assists with alchemy and surgery, and unlocks greater computing power as Lannor expands his knowledge.

Then the system identifies a living Gene Seed, the first component of a forbidden transformation once designed to create soldiers capable of conquering worlds.

Now Lannor has a path no Witcher has ever walked.

Every battle becomes data.

Every injury becomes research.

Every monster becomes another step toward evolution.

To survive, Lannor must master Witcher swordsmanship, weaponize magic, perfect deadly potions, and rebuild his body organ by organ. Cruel nobles, fanatical mobs, ancient monsters, and horrors from other worlds believe they are hunting a mutant.

They have no idea they are witnessing the birth of something far more terrifying.

A dark, system-driven progression fantasy packed with ruthless monster hunting, biological upgrades, forbidden experiments, cross-world adventure, and a rational protagonist who turns knowledge into overwhelming power.

The evolution has begun.