When Keith and Shiro enter the mysterious Blade of Marmora base, they are unprepared for what happens next. The Blade of Marmora is a secret society of Galra rebels—who know Keith has entered with one of their blades. Keith must withstand the Trials of Marmora to unlock its secrets, but only a Galra can activate the blade. Is Keith meant to go through the door and become a member of the Blade of Marmora? Or will the Red Lion need a new Paladin?