March of the SilithidSpeak to Alchemist Pestlezugg in Gadgetzan.
Yes, I gathered that Gracina sent you to me. Your experience in fighting these beasties is priceless; no one to my knowledge has ever dealt with their kind before. As for Gracina's idea that Un'Goro Crater is their heart... perhaps it is. Un'Goro is a mysterious and dangerous jungle to the west of here. Perhaps it is also one step closer to figuring out what the silithid are all about.