|Patron deity||Furo, the Path of Enlightenment|
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Koja served as emissary, advisor, and historian to Yamun Khahan of the Tuigan Horde, even while the Tuigan conquered his homeland of Khazari. There, he advised that Jadaran, Yamun's son, be appointed governor of Alashan.
Following the war, Koja was a guest of King Azoun IV of Cormyr, living in Suzail for over a year. While there, on the king's request, he wrote an account of his experiences with the Tuigan and their culture. He was aided in this by Thom Reaverson, who worked on a similar project and provided Koja with translations and guidance. The finished work was entitled Life among the Tuigan and gave an accurate and unbiased account of the Tuigan Horde. Nevertheless, Koja dismissed it as an incomplete collection of notes about Tuigan customs, and felt that Reaverson put in an equal amount of work. He began work expanding his notes into a larger volume.
However, Suzail was a city he found too chaotic for his liking. As something of an exotic celebrity in Faerûn, he also felt like a scholarly curiosity or a spoil of war from the court of Yamun Khahan. So when priests of Deneir invited Koja to the city of Procampur in the Vast, he gladly accepted. By the Year of the Helm, 1362 DR, Koja was living at the temple of Deneir there. Koja liked Procampur, as it reminded him of the home he had not seen in ten years, and he grew homesick. The priests appointed Foxe to be his secretary and aide while he was there.
There he was close to finishing his next book, entitled Observations of the Tuigan Historian, Recording the Life of Yamun Khahan from his Rise to his Death in the Lands of the West, from Notes made for King Azoun of Cormyr, tentatively shortened to A History of the Tuigan. However, fictionalized accounts of the war like Lay of the Purple Dragons prompted Koja to attempt to get his work mass-published and widely circulated, to present an honest version to the public, rather than be buried in temple libraries.
To this end, Koja and Foxe sought the services of Forgemaster Inkstain and his new printing press. However, Inkstain quoted a price of 10,000 gold lions just for one copy, and 500 lions for extras, which Koja was unable to pay or raise the money for. Therefore, he accepted an invitation to a banquet held by Duke Jozul Piniago, to ask for the money. However, Piniago only wished to pay for a single copy to grace his own library, so that anyone who wished to read it needed his permission. Insulted by the duke's guests, Koja left and prepared to leave Procampur and finally return to Khazari.
However, later that night, he was summoned to a late dinner with a mysterious Faerûnian woman dressed as a Khazari noblewoman, who presented a full and traditional Khazari meal for Koja, reminding him of home. She wished to be Koja's patron and have his book printed, in exchange for a service. Wary of the offer, Koja cast a Sunlight After Storm sutra, revealing the woman to be the god Deneir. Deneir granted Koja gems worth at least 10,000 gold pieces for the printing and asked him to stay in Faerûn and write his books to educate the westerners. However, he could not go home until he was ready to die; the perfect Khazari scene showed Koja how the memories of his homeland would not be so perfect. Koja accepted the task.
Though he was a man of peace, Koja was skilled at describing the details of war and battles in his writings.  He was capable of defending himself, and knew a number of prayers and sutras to help him deal with spirits, including the Pure Thought, Hundred Lotus, Sunlight After Storm sutras, and another to purify food and drink. He also possessed a number of charms and protective fetishes.
- Template:Cite book/Black Courser
- Template:Cite book/Blood Charge
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- James Lowder (January 1991). Crusade. TSR, Inc. ISBN 0-8803-8908-7.
- David Cook (February, 1993). Realms of Valor ("Patronage"), p. 121–147. TSR, Inc.. ISBN 1-5607-6557-7.