Mages who can destroy mountains? Well, here's an anti-tank rifle.
Knights in impenetrable armor? Meet this .50 caliber solution.
Ancient dragons who are the rulers of the skies? An FGM-148 Javelin missile says hello.

After being betrayed, manipulated, and losing everyone he cared about, Allen was dropped into a world of sword and magic with a system that gave him access to an ever-expanding armory of modern weapons and tech.

However, perhaps fate has a twisted sense of humor. This new world was no paradise. It was just another battlefield. He soon found himself caught in the middle of a continent-spanning war between the two major factions of this world. Allen was once again a pawn in a game he had no interest in playing.

But he did not want that, he had had enough of that bullshit. He no longer "believed" in justice and honor, or doing the "right thing". Therefore, as the factions of this world tried to use him, control him, or kill him, they were all about to learn a very simple lesson: YOU NEVER BRING A SWORD TO A GUNFIGHT.