Wielding a Red Sword(1986)

Piers Anthony

Mym falls in love with Orb, then Princess Rapture in Honeymoon Castle, but father wants to force another marriage. In berserker rage, he takes office of War. He tries to ease suffering caused by human conflicts, When demoness Lila says pretty Princess Ligeia is trapped by Satan, he has to organize a rebellion in Hell to set everyone free. Author Note 24-pg bio 1-pg.