Burg, Zil and Ing were a trio of orcs who, along with their friend Mick, wanted to join up with Kajord's crew. Del suggested that they could achieve by stealing a giant sword from the dining room of Baron Silverlode. The fact that this would likely involve killing Draven's in-laws is a pretty suspicious coincidence.
After Mick was killed in battle against Vistrian forces, High Priest Matsomi orders The Party to track down and eliminate the surviving orcs. They do so, and the orcs die in a pitched battle outside Silverlode Castle.