True Power Hunter

Lucien Vale is believed to be a spoiled, talentless playboy, but the persona is an elaborate disguise: after witnessing his stepmother murder his mother, he has spent fifteen years hiding his extraordinary powers while secretly operating as the legendary Rose Knight. When foreign guild-princes threaten Arcadia, Lucien finally reveals his strength, defeats them in the Gauntlet, and earns the position of Grand Marshal—along with the attention of the heiress, Isolde, who had previously dismissed him as a joke.