From PathfinderWiki

Quickdeath is a natural gas found in isolated pockets throughout the Darklands. Colorless and odorless, this hazard is heavier than air and collects in lower-lying pockets. Air-breathing creatures who enter an area contaminated with quickdeath immediately begin to choke and suffocate, as the gas is toxic.1


  1. James Jacobs and Greg A. Vaughan. (2008). Into the Darklands, p. 11. Paizo Publishing, LLC. ISBN 978-1-60125-140-4