These people, called the Ebrou, are uniquely adapted to fishing in underground aquifers because they do not need to breathe. They can take in ambient magical energy instead of oxygen, so they've been relegated to the deepest reaches of this underground civilization.
The Ebrou now have a culture of bullying aggression and character-building stoicism. They bait and tease each other, sometimes violently, to provoke a reaction, in turn leading them to act aloof and thick-skinned (literally and figuratively) when interacting with each other. They make up about 16% of the population, but the vast majority of them live in the lowest levels, tending the underground seas and producing the larger portion of meat that the civilization consumes. In general terms, they tend to be suspicious of outsiders and aggressive in taking what they want.
Of all the races in the setting, they're the least fleshed out at the moment, and I'm looking for interesting hobbies, games, sports, or entertainment ideas for them.
- There is very little racial segregation in this world (even the seas that the Ebrou fish are populated with up to 60% other races)
- There is a fair amount of racial tension between certain races, including the Ebrou
- Other races unfairly consider them cruel, unsophisticated, and violent
- The underground seas often border regions of elemental power, such boiling-hot stone, or massive agglomerations of metal
- They preserve a cultural/racial memory of spacetravel that they're not consciously aware of, forming a bias on their art and architecture. Dark, broad, open spaces (which are very few and far between in the world) put them deeply at ease.
- If it helps imagine them at all, the Ebrou have thick, rubbery skin, sort of like dolphins, and are adapted to nearly any kind of habitable environment, hence their ability to "hold" their breath.
I'd also be interested in any other cultural ideas that come up.