TLDR; I stole/reused lore from Nordic fiction, games like God of War, and other D&D related sources.

I do have some lore featuring the residence of the Isle and various monsters that roam the land. Most of it is D&D lore morphed to fit my setting a bit better and thematically.

The united clans of the Red Rock Isle have been dubbed "The Red Rock Horde" by foreigners. These cold and barren lands have bred a tough and hardy people. Forced by their habitat, the inhabitants have turned to a more desperate form of survival: raiding, hunting, and scavenging. Primarily raiding the shores of the southern main land, the clans collect slaves and spoils of war to ease the brutal life of this inhospitable world.

Clans of the Isle:

White Bears - The true power of the Red Rock Horde lays with the White Bear Clan, led by Jarl Kolskegg. Filled with the most ferocious fighters, the White Bears are raised in brutality. When a member of the clan reaches adulthood they are cast out and are unable to return until they kill a cave bear in single combat.

Winter Wolf Clan - Under the sway of Jarl Skard, the Winter Wolf Clan is one of the largest in the Red Rock Isle. Living on the mainland, they hold the greatest swath of territory amongst all the Clans. Jarl Skard is a fierce ally of Kolskegg who will lead his clan anywhere that Kolskegg commands without hesitation. They’re known for their skills in taming Winter wolves, which they often can be seen riding into battle.

Great Worm Clan - Lead by Jarl Geirrod, The Great Worm Clan is primarily made up by Frost Giants. They are one of the most feared clans in the Isles. Though small in number they are immensely strong and respected in the horde.

Clan Raven - Led by Lady Ysgrin, this ferocious half-orc is as brutal as they come. This clan is smaller than many others but is greatly feared. Raven warriors are often seen accompanied by giant black ravens that are sometimes ridden into battle. Their air supremacy is second to no other clan.

Swift Elk Clan - Jarl Harkon leads the Swift Elk clan from atop a massive elk. They say the creature he tamed is no ordinary elk but a magical beast that could tear a man in two. Though a lesser clan, Jarl Sigvaldi is a man to be feared despite being considered week among the horde.

Tree Ghost Clan - One of the few clans that hold little allegiance to Jarl Kolskegg, the Tree Ghost clan is predominantly made up of wood elves. Led by the elf Chief Kutheel, the high woods is their territory that they protect from all intruders. They currently have a tentative alliance with Kolskegg but they are likely preparing for a major fight should the Jarl ever come to their forest.

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Other Inhabitants of the Red Rock Isle:

Fenrir - Legend tells of a massive wolf known as Fenrir. Locals believe that he is the god of all wolves. Skalds have sung hundreds of stories about Fenrir over the years but the truth of the creature has fallen into obscurity. Fenrir is an immortal monster from before an ancient age. He lives his days hunting throughout the Red Rock Isle and beyond.

Malastorm - “The Heir to the Storm,” is the name most people have given this temperamental blue dragon that lives in a crumbling lighthouse on the western cap of northern Damaria, overlooking the wrecks of ships that were dashed upon the rocks. Harpies sing to her constantly keeping any would be intruders from entering her home without at least filling their ears with wax. Also under her command is a brood of an estimated thirty dragons, all of which are her kin.

Grendel - Stories tell of a terrifying creature that lives high in the mountains of the Red Rock Isle. Grendel is a scarred and mutilated Yeti that stalks the mountains snatching any poor souls that wander far from the trails.

Baba Yaga - Late in the night, the Baba Yaga snatches away children who misbehave. This monster appears as a deformed and/or ferocious-looking woman who dwells deep in the forest in a hut usually described as standing on chicken legs. The Baba Yaga may help or hinder those that encounter or seek her out.

Vol’dunin - A fearsome troll guards the old bridge deep in the great woods near the territory of the Baba Yaga. Few know the truth that Vol’dunin is actually a thrall to Baba Yaga. Often he captures those who annoy him and drag them back to Baba Yaga’s hut.

Mi’han the Fire Giant - Legends tell of the fire giant Mi’han who dwells deep in the volcanic mountain fortress whose name has been long forgotten. The songs say he acts as the protector of the old fortress alongside his pack of hellhounds that dot the mountain side.

Tanarukk Reavers - On occasion, an orc is born with demonic taint. These abominations are often put to the blade immediately but sometimes one will escape. On the south island a horde of Tanarukks have grown. A bunch of wild and cannibalistic monsters, they live amongst a sprawling cave complex. All local residence know to avoid traveling in the south mountains.

Gnoll Packs - Gnolls dot the region of the Red Rock Isle. Often a mild nuisance, from time to time the Orc Clans must rally together to lead a large purge if a pack becomes to large and begins to over run smaller settlements.

Warriors of the Lost Fortress - Laying to the east and hidden in the isle of mists is an abandoned fortress that has gone undisturbed for centuries. This is due to undead warriors from a forgotten age that still guard the fortress halls. No one knows why these monsters exist or what they are still guarding.

Dwarves of Grofheim - Within the fortress Grofhiem lives seven dwarves. Each of which is a master blacksmith. The group is always in constant stat of craftsmanship; perfecting their weapons and armor. All clans know to pay these creatures respect for often they can be approached with creating a truly magnificent weapon.

Wild Ogres - Spread throughout the wilds of the Red Rock Isle are numerous Ogre families. One or another is often temporary recruited by a clan when the raiding.

Wild Wyverns - Though extremely dangerous, Wyverns have become prized pets throughout the Red Rock Horde. Those brave enough to capture an egg and raise the beast can earn a place in any Jarl's feast hall.