Legion: My Illustrated Book Can Summon Heroic Spirits

Allen, the "illegitimate son" who was ostracized by the kingdom's nobles, was assigned to serve as a commander in an abandoned fortress on the border. The fortress is on the verge of a monster-infested wilderness, with few troops and low morale. Allen discovered that he had obtained the golden finger of the "Illustrated Book of Heroic Spirits", which could summon powerful heroic spirits from different civilizations and eras and gain some of their abilities. Facing the invasion of monsters, the prying eyes of hostile kingdoms, and internal contempt, Allen will start from scratch and use a strange army composed of heroic spirits to guard the fortress to conquer the wilderness, and eventually become a legendary leader who shocks the continent!