Welcome to Dungeon Hearts
Several generations ago, the continent of Ikari was invaded. The Outsider races; Humans, Dwarves and their allies, conquered significant territory. The native Family races; Kobolds, Goblins, and allied races, mounted a resistance, but massive waves of reinforcements meant that the last major native stronghold fell 70 years ago.
Since then, the original races of the continent have been largely treated as monsters. Chased into the most inhospitable regions of Ikari, hunted, killed, or at best oppressed, they lack the ability to reclaim their home. Most just try to survive. Some prepare for a futile rebellion. A few study ancient stories to find an advantage to even the odds.
You are a group of adventurers. Eking out a meager living from the poor soil in the swamps and deserts did not appeal to you. You may seek different things, but a life of deprivation is not one of them. The scene opens with an offer from a goblin to help defend their colony from Outsider raiders. From there, it will escalate into establishing bases of resistance, (possibly) discovering the larger story, and fighting Outsider colonialism.