There is minor stuff in here about your flotilla, let me know if you want anything added or removed.
Here is my submission, I didn't put more in about the empire because I wanted to build the narrative they have cornered themselves off from the world.
Faction Name: The Kellerach Clan Union
Alias: Boatbreakers, Coastdogs, The Feudal 4.
Government Type: Allied War Clans + Local Village Cheifs
Faction Specie(s): Humans, Goblins and Orcs
Species Descriptions: As described in OP.
Territory Details: The north east of the map of Nagath lies the Cursed Sea which is bordered by the Icy
Kellarach Mountains and the fields of the
Oni Hollow The Kellerach Mountains are homes to large and powerful frost Orcs, who have been tempered by the harsh enviroments and bitter blizzards. And the mountain gatherers, a very proud clan of human hunters who manage to forage and store food in one of the most difficult places to survive. In the brisk feilds of the Oni Hollow is home to the Ichii clan, a shadowy people who operate as assasins, ronin, warlords and religous figures. Finally near the coasts of the Hollow lies the black banks which is home to a clan of pirate goblins who constantly raid cargo boats and pillage islands to survive, they very rarely leave the northeast.
Faction Religion/Ideology: As a unified clan their religion is very diverse, the Frost Orcs pray to the goat spirits of the mountain which is known as that Krash Faith. The Gatherers also worship the Goat Spirit but have devotion to other spirit animals not recognised by the Orcs such as the Wild Boars and the Owl this is known as the New Krash Reform. The Ichii clan worship the Holy Shadow Dragon named Izaoyi. The Black Bank Goblins have no religon.
Faction Description: The Kellerach Union is made up of 4 Clans that have banded together to form a quasi-nation.
The Frost Orcs who live deep in the Kellrach Mountains
The Gatherers who live near the outer edge of the same Kellerach Mountains.
The Ichii Clan who live in the Oni Plains
The Black Bank Pirates who live on the coasts of the Oni Plains.As very diverse and fairly recently unified faction, the Kellerach Union is an effective but shaky one. Thier government is actually comprised of 4 warlords which each represent their own Clan. Then there is a further Village chief for each settlement but since the union the cheifs dont always match the clan of the village which has mixed results. But their balance of skills and resources works extremely well. The Gatherers excel in food and construction. The Frost Orcs excel at Mining and raw military might. The Ichii clan lead in technology and information. And the Black Bank Pirates excel in seafaring and obtaining treasures. This productivity is what holds these very different clans together.
Faction History: The history of this faction is somewhat fragmented. The Union of the clans which now form the Kellerach Nation were previously quite indipendent of each other. The Ichii clan would occasionally hunt and kill rouge goblins from the black banks but only in response to a direct robbery. And the Frost Orcs historically bullied the Gatherer Men out of the mountains so they could keep the precious natural mines to themselves, but after this they generally left each other alone. All 4 factions managed to live as neighbours with icy but independent relations.
Ironically, it was outside conflict which brought them together.
For as long as anyone cared to remember the Black Bank Goblins had been running amok through the seas, mainly robbing cargo ships from Daigon Zul and the Bay of Teeth and exploring treasure coves along the northen coast of the cursed sea. This was not to last however one early morning a large fleet which would late be identified as the
Regal Flotilla managed to disrupt one of the pirate raids of the goblins and very quickly and effectively destroy the unorganised pirate ships. In embarassment and fury the Black Bank Goblins sent a larger war focused fleet to not only retaliate against the flotilla but to try and regain some of the losses from their ships, only to be decimated in a more lengthy and violent naval battle.
The goblin pirates were now cowering, how could they return to the sea after two humilating defeats in the span of of 72 hours? (this would be known as the Blackest Weekend). Desperate the goblin clans approached the only other capable fighters they had contact with, the notorious
Ichii clan who lived in the Oni plains. At this time the Ichii clan were not the only Ronin clan in the plains, they were at war with the equally dangerous
Kagemura Clan who had been slowly whittling the Ichii numbers down and stifling their influence.
In a very shaky meeting of mutual interest, the Ichii clan told the Black Bank Goblins that they would only help their naval campain if they could provide support on the ground against their bloody turf war against the Kagemura, so they could finally rule the Oni plains as the sole clan. Now the goblins were skilled pirates but far from soldiers and knew they would stand no chance providing support against a highly skilled clan of human ronin, even with greater numbers, so they went elsewhere for help. Luckily a few goblins lived near the mountains and were able to provide a link of communication with the Frost Orcs in the heart of the Kellerach. The Frost Orcs were very skilled military fighters and had the numbers and the natural physical advantages to help the Ichii clan wipe out thier rivals. But they were isolationist and untrustworthy of pirate goblins, let alone humans. But luckily the diplomacy of the newly formed Ichii alliance proved helpful. With their moderate diplomacy skills they were able to promise more precious stones from across the sea in pirate raids and a promised increase in resources from a campaign against the regal flotilla. In exchange for these rewards the frost orcs not only joined the fight against the Kagemura but also re-opened mining trade routes to the previously exiled Gatherer clan who in turn offered to feed all other 3 clans with their massive food stockpile during the war effort.
With that battle all 4 clans became the Kellerach Clan Union and destoyed the Kagemura clan in mere weeks of battle. Now the Ichii (although still not fully recovered from the ronin war) was able to train and upgrade the Goblin's naval warfare with their highly advanced technology. Which allowed them to raid more often and successfully, and even ocassionally fight off the regal flotilla where they would encounter them. The gatherers and frost orcs continue to exchange trade routes for mining and food but all 4 clans are still somewhate shaky about their new alliance, which is held together by the
Four Lords of Kellerach .
A now defunct ronin clan that was wiped out by the Ichii clan along with the help of the other 3 clans which lead to the Kellerach Union. History about them is very scarce and hard to verify as the information from the is almost entirely from their enemies. But they are rumored to been the indigenous people of the Oni plains and the Ichii were originally immigrants from the Daigon Zul area.
Despite skirmishing with the flotilla for a decade and a half, the Kellerach Union knows very little about them beyond their effective naval warfare and ability to occasionally disrupt a pirate raid. The Black Bank Goblins most want to see the flotilla completely wiped out. While calmer voices in the lords such as the Gatherers think that fighting such a powerful enemy so far out of their own territory is stupid.
Unlike most factions in Nagath, the Kellerach is almost completely removed from the dealings of the empire. Since all four clans have essentially been kept into the mostly frozen wasteland corner of the world they resent the 'kingland' and want nothing to do with it. They only want free reign of the sea, but the Ichii clan are aware as they grow in influence they may have to confront the empire sooner or later....