The Silverfish are a species of parasitical insects.
The Naga were becoming extinct due the parasitic silverfish who had overrun the caverns below their natural desert habitat. Only a few Naga survived, while the silverfish's numbers increased until there were thousands of them.
When Finbar came to the Naga for their support in the Dragon War, he was told by the Naga King that if he exterminated the silverfish, the Naga would join his army. Finbar located the silverfish in a large nest. Using some grenades and bombs, he obliterated the silverfish and their Broodmother.