Battle Mage of Hogwarts

Right hand holding a PPSh, left hand clutching a wooden stick, two Glocks strapped at the waist, a blue-glowing Gatling gun plus a heavily modded RPG — completely flipping the wizarding world's combat style on its head. Using modern knowledge to synthesize magic, and overwhelming enemies with sheer firepower, thus the Third Dark Lord was born!! PS1: This book is not dark fantasy. PS2: New author, new book, updates whenever. PS3: Never read the original work; the reason for writing this novel...