The All-Meat Knight, Burp, Blows Up Magic. Seems Reasonable, Right?

Good news: I transmigrated, and brought along a System that can endlessly derive martial arts techniques. Bad news: The System needs huge amounts of energy to derive techniques, and every day I'm pushing myself to the brink of starvation! To get enough to eat, Kane had no choice but to embark on a journey of “feeding.” Scene one: A wizard tries to rob him. The wizard shows off and casts a fireball. Kane opens his mouth. “Crunch!” He swallows the fireball whole. Wizard: “???” Scene two: An abyssal sacrifice ritual. The believers pray, and the Demon Lord descends. Kane's eyes light up. “Crunch!” One of the lord's legs is gone. Demon Lord: “What the hell! Stay away from me!” Scene three: The grand divine judgment. The high priest chants, and the gates to the divine realm swing wide. Kane wipes the drool from his mouth. “Crunch!” The divine core is chewed up like a candy bean. The gods: “...” From then on, every supernatural being was cut off from this continent. Wait, you're a pure physical knight. How can you eat magic for a living?! Kane (picking his teeth): “Isn't it perfectly reasonable for pure muscle to smash magic?”