Raid-wars were small scale conflicts fought between different families, known as steri, within the Adnerem species native to the planet Adner in the Expansion Region. The aim of a raid war would never be to entirely eliminate the opposing steris, as a weaken steris might have proved a useful ally, but simply to alter their status within Adnerem society. Powerful steri with conflicting goals would commonly engage in raid-wars and smaller steri might band together in a raid-war against a more powerful steri who was abusing their power.
Sources[]
"Alien Encounters" — Star Wars Adventure Journal 11 (First mentioned)- Alien Encounters