Burst!

Publisher's blurb: The Eye of Lolth has been stolen from a Hillsfar Museum. A band of adventurers are sent to track down this holy item. On the way, they will face perils of the Underdark and a new type of monster, blessed by the son of Lolth, created to destroy the Free Peoples... and Lolth. Enjoy this Tier 2 extravaganza. If you like Alien, then you'll love Burst!