Everyone says the Guardian class is worthless.

Edwin knows better.

Reincarnated into the world of a game he mastered, Edwin remembers one absurd secret: the fastest way to make a tank stronger is to let it suffer. Horse-dragging, burning alive, and every other reckless training method become stepping stones toward impossible growth.

While nobles dismiss him as a lunatic, Edwin quietly builds the strongest shield the kingdom has ever seen—long before the disaster that will put everyone behind it to the test.