Tova

The various Giff cultures of the Feysky (the Kubu, Seokwi and the Renoster, as well as a variety of small minority groups) the all share another (less hierarchical) class division which applies only to Giff, and which splits the Giff into two distinct groups, based around the type of education they receive and the types of professions for which they are best suited (though they intermingle, intermarry, etc all the time).
When a Giff reaches the age of 14, their family holds a "coming of age" ceremony called the Tova where the child must choose their path; either Tomar or Vamar. Neither path is considered "better" than the other by society, though some individual families have a strong tradition and preference for one or the other, with parents or other relatives often trying to categorize children from an early age, if not push them in one direction or the other.
* Tomar (meaning "the struggle") is the path of warriors, and physical professions. From hunters, construction and dock workers, up through the ranks of soldiers through to the Windmarshal him/herself, all are Tomar. Their education focuses on physical development and practical, hands-on skills, though the modern military (of sophisticated aerial tactics, gunnery equations and the beginnings of magitech) has adapted, now requiring officers to attain various skills and other education at each rung before formalizing their promotions. Although neither path is considered "higher" or "lower" status, the fact is that Tomar fill both the "lowest" professions ("unskilled" labor and enlisted soldiers), and some of the "highest" ones (high-ranking military officers).
* Vamar (meaning "the wisdom") is the path of engineers, scholars, artists and merchants. In ancient times, when resources were more scarce, only Vamar Giff received education, learning the ancient songs and skills (and later books). In the beginning, all construction was considered Vamar, but over time the grunt work made building more of a Tomar profession, whereas only planners and designers needed the increasingly advanced mathematics and geometry skills. It's not uncommon for Vamar to consider themselves "superior" to most Tomar, because except for mid-to-high ranking military officers, Tomar tend to be far less educated. However, society as a whole teaches that there is great honor in being even the lowest of warriors, and that skillful Tomor builders and other workers should be respected as well, for all are equally important to society.
In the Marmar Thalassocracy, which is dominated by the fairly rigid Kubu culture, these paths, once chosen, are considered (metaphorically) etched into one's soul. If you choose one or the other, and find that it does not fit you well, then you are just destined to be a low-ranking profession.
The Seokwi and Renoster Giff tend to make more allowances for such mistakes; though you still cannot change your Tova - your path - in those cultures (and particularly in the sky nations OTHER than Marmar), one who regrets their choice can often get an apprenticeship later in life which lets them find a more suitable, almost "hybrid" profession. For example, a dissatisfied Tomar soldier or laborer could try to find a Vamar engineer mentor who might be generous enough to teach them some of their skills, training them to become a surveyor, or perhaps a construction supervisor. And if a Vamar found the merchant life boring and yearned for adventure in the Seokwi Confederacy, they might join the navy and be trained as a gunner, quartermaster, navigator, or any one of the many tasks aboard a vessel which require planning or calculations.
As you can imagine, the terms Tomar and Vamar come with massive amounts of cultural baggage; the two groups tend to dress differently, fall into different hobbies and passtimes due to peer pressure and expectations, and there are countless stereotypes and other assumptions about individuals of one path or the other, which - as with all stereotypes - may not at all reflect any individual "branded" with that path. As mentioned, the Tova is purely a Margiff concept; Tabaxi and other races who live with the Giff tend to become well-acquainted with it, but it in no way applies to non-Giff (nor would most of them want it to). Though some Giff tend to use Tovar and Vamar as a sort of shorthand slang for describing the personalities, or strengths or weaknesses of other humanoids.