Twilight Mushrooms (Hazard, Plant [Fungus]) CR 7
Twilight mushrooms are purplish-black mushrooms about 4 to 6 inches in height, growing in patches of 5–10 mushrooms and are only found in damp, dark underground areas. Twilight mushrooms sense vibrations and burst forth a cloud of noxious and choking dust when a living creature comes within 10 feet of a patch. Creatures within the area must succeed on a DC 15 Fortitude save or take 2d6 points of Constitution damage. One minute later, another Fortitude save at the same DC must be made to avoid another 1d6 points of Constitution damage. Whether or not the saves are successful, a creature is disabled for 2d4 rounds from fits of choking and coughing. Such a creature can take no action other than to
Sunlight renders twilight mushrooms dormant, and cold instantly destroys them.
Twilight Mushrooms from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene.