I, Slughorn, Wield the Warhammer to Slay Chaos

A three-hundred-year-old Space Marine veteran transmigrates into the world of Harry Potter.

Bern Slughorn, in his previous life, slaughtered 130,000 daemons in the Warp and happened to stab the daemon primarch Angron through the heart. In this life, he opened his eyes as the three-year-old great-nephew of Hogwarts' Potions professor.

Fenrir Greyback wants to bite through the bloodline of a pure-blood family? Bern transforms into a three-meter-tall Space Marine on the spot, rips off the werewolf's head with his bare hands, and keeps its spine as an ornament. Horace is so terrified he digs out the Wolfsbane Potion. Dumbledore circles Bern three times before reaching a diagnosis: a natural Metamorphmagus whose transformation takes the form of a Space Marine.

From then on, the wizarding world takes a sharp turn. While other young wizards play Quidditch, he dismantles chainsaws to turn them into chainswords. While others brew Felix Felicis, he tosses ceramite powder into his cauldron. Lucius Malfoy comes calling to curry favor. "Please look after my Draco, nephew." Bern nods. "Sure. First, I'll teach him how to load a bolter."

Voldemort is resurrected? The Death Eaters are gathering? Bern polishes his power sword and sneers. "I've slaughtered half a city's worth of Warp daemons. How many times do you think I'll need to swing to cut down a Horcrux made from your soul fragment?"

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.