Loog was the descendant of the legendary hero Blaiddyd of the Ten Elites, who had once quarreled with the Adrestian Empire during the War of Heroes. In Imperial year 747, Loog raised an army to demand independence for the region of Faerghus from the Empire, sparking a rebellion that came to be known as the War of the Eagle and Lion. Loog was aided by his sworn friend Kyphon and an advisor, Pan.
Loog and his resistance army emerged victorious in 751, after defeating the Emperor's army at the Tailtean Plains. The Church of Seiros intervened and House Charon served as mediator, resulting in the founding of the independent Holy Kingdom of Faerghus. Loog was crowned by the Church as the nation's first king, and has been hailed by the people of Faerghus as the "King of Lions" ever since. He remains a popular figure long after his death, with books such as "Loog and the Maiden of Wind" reciting his chivalrous exploits.
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A damaged book in the Shadow Library of Abyss titled "Burnt Remnants of a Report," insinuates that Loog enlisted the support of Those Who Slither in the Dark to achieve victory in the War of the Eagle and Lion.
Loog is likely a corruption of the name Lugh, a prominent god in Irish mythology and one of the Tuatha Dé Danann.