I Summon the Demon King's Army After His Death

Gregory Lamont, a young noble forced to lead his family after his parents’ death, grows up in a war torn borderland constantly sacrificed by reckless royals. Amid the chaos, he finds inspiration in the legend of the Demon King, the figure he admires most. One day, his life changes when he suddenly receives a mysterious system called Legacy of the Demon King, promising him the power to become as strong as the legendary ruler and command a demon army.