Deliver Belgrom's Sealed Note to Moktar Krin in Thousand Needles.
So, Korran has come to a similar conclusion about these insects--they seem to be a larger threat than we assumed.
A few days ago a hunter returned to me from Thousand Needles nearly dead. He was with a raiding party sent to drive a dwarven excavation team out of the Shimmering Flats. During the attack, more of these insects erupted from a cave in the dig site and nearly killed the party.
They were led by Moktar Krin, and they've taken refuge on the border of the Shimmering Flats. Bring him this note.