The Swarm Grows is the first step to short series of quests involving silithid monsters in Thousand Needles.
To Get This Quest Edit
You will need:
Many travelers who've come through the Crossroads helped me gather eggs from the Field of Giants, and many of them have tales of how deadly the creatures are. I've heard enough to consider them insects a much larger threat than my masters first thought.
Belgrom usually be found outside the warriors' guild house.
I envy you, <class>. You have the look of someone who's been outside the walls of Orgrimmar for a while.
I myself would travel in the name of the Warchief if Thrall didn't have need of my skills here in the city. But he leads us well, and I trust his judgement--I remain here for as long as he needs me.