While the Kuela are a whispered fear, worried and fretted about over the centuries, the Iroshai are the real threat. Peasants and kings alike fear the word, for the Iroshai are never gone so long that no one remembers their last assault.
Iroshai are Kormin, following a particular philosophy. All Kormin must find ways to deal with the vulnerability to the arcane powers wielded by the other races. Some choose the path of trust. Some choose the path of isolation. But some choose to fight. Iroshai believe that so long as the other race exist on Kenafiir, then the threat of arcane oppression of their people remains an unacceptable truth. The train themselves harder than any other people on Kenafiir, believing that their dedication is the only hope their people have of true freedom. They will never overcome the Kormin vulnerability to magic, but over the centuries they have found that the best way to overcome mages is to terrify them so thoroughly that they will do nearly anything to avoid the Iroshai. To that end, the Iroshai train themselves for resilience and are willing to make any sacrifice to bring mages down. As soon as arcane magic appears on a battlefield, Iroshai will throw themselves recklessly through hordes of soldiers, enduring a hundred cuts in order to tear casters in half before they themselves are brought low. And while Iroshai will coldly slaughter any number of soldiers or even civilians, they take great pains to make the deaths of magic users long, painful, and public. The message is clear. When the Iroshai march, mages will be needed in order to drive them back. But those who step forward are almost guaranteed a grisly death.
In recorded history there have been 12 Iroshai invasions, always stemming from deep deserts where only the Kormin can survive comfortably. Each time a major military has pushed them back, but always at a great cost. Strangely, each time the rivals of their besieged neighbors pointedly refrain from taking advantage of the situation. The risk of pulling defenders away from battling the Iroshai is too great.