The Venomous Temple (2004)

A One-Round Living Greyhawk Principality of Naerie Regional Adventure

From the introduction:

A few months ago, a group of heroes entered the tomb of Satyr’s Horn and found instructions on how to enter an underground temple of Pyremius, which vanished long ago. So far, no one has survived while trying to pass the three deadly entrances to the temple, but now, the instructions on how to pass the entrances have been found. Great deeds, perils and treasures await heroes who dare to enter the temple. But rumors have spread far and wide...

A one-round adventure for [character levels] 2 - 8.

A stand-alone sequel to NAE4-01: The Living and the Dead.