Thracia 776 is set within the second generation storyline of Genealogy of the Holy War, while the exiled prince Seliph is still in hiding and preparing to battle Arvis’ hold on the continent. Main protagonist Leif is the deposed heir to the Republic of Munster, who was rescued from an attack by the forces of Thracia by Finn, a friend of Seliph’s father Sigurd. Spending most of his life on the run, Leif eventually finds shelter in the village of Fiana.
One day, the villager’s protectors are routing bandits when Raydrik, the new Duke of Munster, attacks the village in search of Leif, kidnapping Leif’s friends Nanna and Mareeta. Devastated by the town’s destruction and his friends’ abductions, Leif decides to face the forces of Thracia and retake Munster. Aided by Finn and a growing band of rebels, he rescues both Nanna and the enemy-controlled Mareeta, and defeating the forces of both Raydrik and Veld, a high-ranking priest of the Loptous Sect, as they retake Munster and liberate northern Thracia.
Leif’s forces finally face Raydrik in battle, but upon his defeat Veld transforms him into an undead monster called Deadlord Mus. Leif destroys Mus, kills Veld, and cements his forces defending Munster and northern Thracia from the Grannvale army. Fire Emblem: Thracia 776 is a tactical role-playing game in which the player takes command of a group of units and goes on story-based missions with varying objectives, from defeating specific enemies and rescuing targets to escaping unharmed from engagements.
Maps hold a variety of different terrains, from flat plains to mountains; combined with a unit’s own abilities, the environment affects movement. There are also locations such as towns and churches where items, in-game currency or health may be granted of a unit remains there long enough. In addition, a “Fog of War” effect is present in some maps, where the map is obscured to players until the unit advances and reveals the portion of map within their movement and attack range.