From what scouting we have managed to muster, we believe that the foe south of the gnolls is an insect-like race. Frankly, it is irrelevant whether or not if they're sentient. If they are driving the gnolls to frenzy against us, then they are as big of a threat - if not more - than the gnolls.
Drive deep into where these Zukk'ash insects dwell; it is known as the Writhing Deep. Thin their numbers and report back to me what you find, bringing back their carapaces as evidence of your handiwork.
Well done, <class>. Though the extensiveness of the Zukk'ash presence will not be thwarted with anything less than a full-scale invasion, you have bought us some time so we can devise a proper strategy.
I will be sure to have these carapaces analyzed; we'll need to learn everything about them before we deal with what has unfortunately turned into a much larger issue than we had anticipated.