The Kagushgala Raiders were a group of pirate Heretics and bandits that used to reside in the easternmost island of The Eari Isles. Little about them was known to anyone else, other than that they would periodically come forth from the sea to raid coastal towns, plundering anything of worth and stealing away people that couldn't escape in time or that weren't cut down by their blades or arrows.
They were originally a tribe in the Eari Isles before the Alammaran colonization of those islands, fishing and sometimes trading with coastal port towns. There was a focus on strength and individual power within the tribe, but not an immediate primacy of it. Sometimes, when resources were running low, and also as a mark of transitioning from boyhood to adulthood, the tribe would raid one of these coastal towns. This all changed with the advent of The Alammar Empire and their conquest over the land. In 1807 B.S, when the Alammar Empire began to colonize the Eari Isles, the tribe was a major opponent of theirs, refusing to be taken over and fighting off any military attempt to conquer them.
This led to a long protracted conflict between the Alammar Empire and the tribe. While the Empire was much, much larger, with gigantic army still not having gotten off their high of the initial conquest and the entire Continent at their disposal, the Eari Isles were still far away, separated by the entire Southern Ocean, making transportation of troops and supplies a nightmare. The Austral Dak-Humih (the Alammaran name for the territory of the Eari Isles) was still relatively small at the moment, largely outnumbered by the indigenous peoples, who could flip sides on a dime and weren't very integrated into the Empire at large. As such, the conflict, while nearly entirely localized into the Isles, raged on for a long time.
There were very few real battles between two sides, just occasional skirmishes and raids into each other's villages and ports. Eventually, the Empire began to build up its military capabilities in the region, and with advancements in naval technology, managed to build up a sizable army, which they used to finally storm eastward and fully defeat and conquer the tribe, integrating them into Austral Dak-Humih in 1699 B.S. The tribe spoke a different language, and when Imperial officials asked captured members of the tribe what the name was for their people, they just replied with a verbal curse word, Kagushgala. The officials then took this as their actual name, and called the tribe the Kagushgala.
Over the years, significant effort was poured into destroying the culture of the tribe and replacing it with the homogeneous Alammaran one. While a difficult process not made any easier by the local people's resistance to such an idea, over the long period of time, eventually the Kagushgala culture was sanded down due to the small amount of individuals that comprised the culture. Their language and a good chunk of their customs were entirely lost, those that remembered them lost to the grave. Some parts were kept and even accentuated, like the militaristic part of their culture being emphasized in order to create a separate islander shock troop force for use against bandits and other natural threats to the Empire. This backfired on the Alammar, because when these Kagushgala warriors returned home, they more often that not also became bandits, raiders and pirates, building off their experience in the army to better fight and raid.
This would come to an end, as with all things, in The Splintering. The Kagushgala were the first of the various islanders to rebel against the Austral Dak-Humih administration in the Eari Isles, pushing whatever loyalists remained on the Isles out and slaughtered them in droves. While a good number of them were satisfied to leave it off at that, another group of them decided that this was their time, and sailed off with other groups of Islanders to continue the fight against the loyalists elsewhere. They contributed to the various myriad victories the rebels scored against the loyalists.
When they returned, they were veterans of a new conflict, and with no one really forthcoming as leader (and the previous leader having been an Austral Dak-Humih appointed governor who was a loyalist), they were made the new leaders of the new Kagushgala tribe. Following the Splintering, they were isolated away from most of the chaos, with only a select few cases of banditry or conflict with other emerging tribes. However, the withdrawal of the Alammar Empire had left them with several key problems. For one, the Empire had nearly totally extracted all the resources in the area, meaning they had virtually nothing to trade with. The fish had been victim to excessive overfishing by Dak-Humih fishers and sailors, and even if they did have resources, all the nearby coastal ports or towns on the mainland were in absolute anarchy, while nearby villages and towns were fiercely independent and isolationist. The land also wasn't much good for farming, which left the Kagushgala with only one option: to raid for their survival.
With their military expertise, and left relatively unopposed by any organized force, the Kagushgala began to raid towns and settlements with a vengeance, taking food, water, things that looked cool, shiny things, anything that was valuable and wasn't nailed down. At first it was just for survival, a granary here, a fisherman's hut there, but then as trade began to slowly bounce back, it became more profitable. Turns out, with no unified force tying towns together, few cared about whether or not a golden chalice came from their distant neighbors or not, just the fact that it was a golden chalice.
Things began to spiral further and further, with the Kagushgala eventually beginning to participate in the slave trade. The nation of Naun was also beginning to spread around this time, gathering further territory as it warred its way through the Eari Isles. Eventually it came to the island of the Kagushgala, where it decided to negotiate with them. While they could potentially defeat them and conquer them in a war, with the Kagushgala's fighting prowess it would inevitably be a bloodbath and a Pyrrhic victory for them. The raiders also decided to come to the table because fighting a war against Naun would lead to their inevitable defeat and demise. In exchange for the Eari not invading the Kagushgala and giving incremental protection to them, the raiders would give a portion of the earnings to them. This was agreed upon, and the Kagushgala went about their business as usual.
The Kagushgala were heretics because of their negative experience with the Alammar Empire, which was backed by the Fervoni Holy Union. Because of their small population sample, no one was born an Emissary nor were there any really powerful magicians other than the occasional sailor who only nominally used their abilities to help out with a moderately bigger catch. As such, their first real encounter with the real gods was a heavily negative one enforced by centuries of colonialism, causing them to hate the idea of the gods. Magicians were officially banned and anyone who dabbled in magic was shunned as demons and executed by drowning.
With no one to stop them, and separated from any land force and naval force by the South Sea and technically a vassal state under the wing of the Eari, no one could really do much about them other than sometimes pay them off. This continued for another 120 years, long after the end of the Age of Frost and the global struggles that brought. It had been forty years since, and things were changing. The thing that mattered the most was the ascension of one Elder Dirya to head of Naun. When she found out what was happening with the Kagushgala and Naun's deal with them, she was disgusted and immediately cut them off with the full intention of destroying them.
After that, seeing their existence was at stake again, the Kagushgala decided to strike first, raiding and nearly totally destroying the town of Hesai. This was the last straw for Dirya, who cut out the slow buildup to war and immediately sent the navy after the raiders, lead by Admiral Ieta. Ieta was a veteran of the Age of Frost, if unofficially. He led nearly a dozen battles against the undead menace in the north, winning every conflict he was a part of, and was well versed in warfare. The battle against the raiders lasted just three days as the Naun navy proceeded to cut down the meagre transportation and repurposed fishing vessels of the Kagushgala, before surrounding the island and bombarding it with magic at a range where the archers of the Kagushgala couldn't get them, softening them up considerably before one gigantic assault against them.
Afterwards, the island was placed under Naun control, who soon rebranded into the Eari, and the Kagushgala were defeated and subjugated for the final time.