Player's Secrets of Ariya is a sourcebook for Birthright that describes Ariya, a theocratic domain on the south coast of Khinasi. The back of the book includes plot hooks including a religious war threatening from the west, another war from the north, and pirate activity.
Cliff Ramshaw reviewed Player's Secrets of Ariya for Arcane magazine, rating it a 7 out of 10 overall. He described Ariya as a "sun-kissed domain" that is "exceptional if only because rather than yet another variation on Northern European feudalism it's an altogether more romantic, magical and unfamiliar place - one that owes much to the Arabian Nights". Ramshaw felt that the domain of Ariya is "imbued with spicy richness", he felt that the plot hooks were "somewhat ordinary", saying: "They're not bad, just not as imaginative as the setting itself. Still, there's plenty here to get a good referee improvising."