From publisher blurb:
The Vault of Pestilence is a compact, three page, oneshot dungeon for adventuring parties of 3rd-4th level. After a cult's ultimate sacrifice to the God of Pestilence fails, a deadly mold has begun to spread throughout the region, threatening all forms of life.
This dungeon is written to be easy to read and easy to run. Can the party trace the source of the mold while recovering the treasures inside? Can they learn what happend to the cleric Xierhan and his vile cult? And most importantly, can they do it without becoming infected?