Frodia is the largest and most successful child kingdom of Garnia. Frodian independence was caused by 2 main factors.
First there was the distance from the core of the Garnian civilization. Smaller numbers of ethnic Garnians and larger numbers of other ethnicities and non-humans caused a cultural paradigm shift away from the societal structure and caste system prevalent in Garnia.
Second there was a religious schism caused by the large number of non-Garnian peoples in the territory that would become Frodia. Ethnic Garnians began to join in with the natives in their cultic practices, adding a key god of non-Garnian origin- Frodal. Frodal’s origins are unknown to modern scholars, but one theory is that he was an archmage that ascended to godhood several thousand years ago. Certainly the study of magic is key to the society of Frodia, and the cult of Frodal is the most prestigious and powerful in their nation.
Certainly since the fall of the ancient Sidhe empire (and perhaps even including them) Frodian sorcerers have a reputation for being the most powerful in the world. In times of peace Garnian mages have studied there and the Great Necromancer was a student at their high academy in Cothe.
Frodia has several very large cities Cothe being the largest.
Frodia is a kingdom in name only, the kings of Frodia are elected from among the priesthood or the high council of wizardry making it functionally a theocracy or magocracy. The reigning king is most often a high-priest of Frodal.
The wizard/priestly quarters of Frodian cities are wondrous to behold.
Frodia has often had a special relationship with her southern neighbor the kingdom of Wodanslund.