Warhammer 40K: System Error, I Summoned the Arch-Traitor!

Title 2: I Wanted the Wolf King, but I Got the Warmaster Before the Fall.

Transmigrating into the most despair-inducing Underhive wastes of the 41st Millennium, Kaelen, a mere mortal, thought his days were numbered.

When his cheat system finally activated, he prayed for one thing: Just give me Leman Russ. I need the Wolf King to survive!

[Ding! System error. Target locked: Davin. Salvaging soul...] Instead of the loyalist Wolf, a dying giant crashed before him, his soul teetering on the edge of Chaos corruption. It was the Warmaster himself. Horus Lupercal.

Staring at the tragic, uncorrupted demigod covered in scars, Kaelen went completely silent.

"Horus," Kaelen sighed, pushing up his goggles. "Your father is a corpse on a golden toilet, your brothers have all gone insane, and the Imperium is a rotten hell-hole."

Horus: "...?"

No divine bloodlines. No genetic enhancements. Just a mortal commander armed with future knowledge, a glitchy system, and the most powerful Primarch in history serving as his loyal sword. If the galaxy is broken, they will carve a bloody path from the Underhive to Holy Terra to fix it.

🩸 [The Ultimate Fix-It]: Erasing the tragedy of the Heresy. Horus never falls, and the traitors will bleed.

🧠 [Mortal Domination]: Watch arrogant Space Marines and Chaos Daemons experience absolute cognitive shock when outsmarted by Kaelen's ruthless modern strategies.

⚔️ [Purging the Dogma]: Slashing heretics, kicking the Golden Throne, and reviving the Emperor's true dream.

👑 [Building a New Order]: From a desperate survivor to the shadow ruler of the Indomitus Crusade.