I'm a good fan of Runebound and Descent. I find the setting of the world new and interesting with plenty of potential for role-playing. The problem is that the makers of the game haven't released a solid world-book for the Runebound/Descent line, only giving tidbits of background lore and world information with each game as well as implied information about the races and monsters of the world. Suffice to I wouldn’t mind if they actually made a sourcebook for D&D 4.0 in order to turn the board game into a role-playing setting (Although inventing a whole new RPG system is not out of the question). With a little adjustment, a lot could be fit into the world using existing systems, although certain races might have altered backgrounds and a new pantheon of Gods would have to be drawn up, considering that I don't think Kellos alone can fulfill the role of the Gods of Terrinoth, as there is likely other gods and goddesses both good and evil. Certain races already fit in the world:
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The Common Civilized Races
Humans: They're everywhere, primary central Terrinoth and the free cities, but also the Dread Isles (west), Al Qualim (south), Ishiem (north). Only the Wildlands (east) have a proportionally small population of humans, as the region is populated by lots of savage races including the beastmen
Elves: There are two primary races of elves. The Frost Elves who make their homes in Ishiem and the Forest Elves who make their homes in numerous woods in central terrinoth as well as the Wildlands. While the race en mass lives away from the free cities, numerous pockets still make their lives in other lands, as tradesmen, explorers or adventurers.
Dwarves: Rule the city of Forge but also have numerous strongholds in a number of mountain ranges. Although only Forge retains strong ties to the Free Cities (as it is one of them), the Dwarves are involved heavily in trade of produced goods, precious metals and of course mining and are much more involved with humanity than the elves.
Halflings: The Halflings have scatters of villages across Terrinoth and are stout and involved friends to humanity. They also have a strong presence in the free cities fulfilling numerous roles such as tradesmen, cooks, labourers or the numerous other jobs that the cities have to offer.
Orcs: The Orcs are an accepted race in the free cities, ruling Dawnsmoor but having a presence throughout all the free cities. They are often hired for military pursuits but also make excellent labourers due to their natural strength and resilience. While they can be brutish and short tempered, they are a common sight in the free cities.
The Uncommon Civilized Races:
Teiflings: Teiflings are decedents of an infernal bloodline, possibly from people either tainted by infernal magics or decedents from demonic bloodlines. Not a common race per say, teiflings are not well accepted in a number of the free cities, but hold some influence in Nekhall and Dawnsmoor as well as the Dread Isles where they dive themselves into shady dealings and other darker practices. Some teifling households hold great amounts of underworld influence in some locations. A few become adventurers either for love of money or the perhaps redeeme their corrupt bloodline but most of the race are unaligned to evil bent in nature much like their forefathers and serve as agents for dark powers.
Dragonborn: The Dragonborn were not a naturally conceived race but a race created by the Dragonlords themselves. When the Dragonlords rose to power, in an effort to create a race of superior draconic servants captured a number of humans and infused them with eldritch sorceries, twisting them into a race of Dragonmen much stronger than human stock and perfect warriors for the Dragonlord's vision for the world. The Dragonborn were loyal servants to the Dragonlords and when the armies marched to war, the Dragonborn marched with their armies, bringing destruction in their path. Powerful warriors with deadly skill in arms and natural abilities, the Dragonborn were among the fiercest of weapons wielded by the Dragonlords. But eventually the Dragon Wars came to an end and the Dragonborn suffered such casualties that they were almost driven to extinction. Now the Dragonborn are a fallen race, possessing no true kingdom of their own. They live in small isolated settlements, living and breeding with others of their kind. Those few who come to the free cities are those seeking their fortune as warriors, mercenaries, labourers, adventurers and the like. They are distrusted and sometimes by most of the other races as a reminder of the many scars of the Dragon Wars. While most of the Dragonborn have chosen to live in the now, a number are still loyal to the imprisoned Dragonlords and seek to secure their release so that they can once again gain dominance in the world.
Eladrin: The Eladrin are a mysterious race that emerges from the Wildlands from time to time, curious about the civilized world. The Eladrin are elven-like in appearance but that is where their similarities end. The Eladrin are creatures native to the Feywild, an alternate dimension where numerous creatures foul and fair reside. While they have a sizeable population in the Feywild, they rarely have the need or the wish to enter Terrinoth. Those few who do are those seeking to explore and adventure in the new world and thus have no true settlements in Terrinoth and instead associate with other races as travellers. They are on good terms with the elves and are often welcomed into their community. There are rumours that the Eladrin and the Elves are related races, but no scholars really know for sure.
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Certainly a lot of D&D monsters can be fit into the setting. Goblins certainly would have a role to play. But as for the unique monsters, they would have to be statted out. Kobolds for instance wouldn’t exist in the D&D incarnation as it’s already been defined that the Kobolds the world are a diminutive form of beastman. As for Beastmen, the closest thing I can see to fitting them is Bugbears. Bugbears look a LOT like beastmen, so using Bugbear stats for beastmen could work, although you probably would have to expand the monster list considering there is only two builds for Bugbears. As for Kobolds themselves, they would have to be made totally differently. Then there is Razorwings and the Ferrox that don't have a D&D equivalent. So what's your opinion on having an RPG based on the Runebound/Descent world?