Winter Bloom (Hazard, Plant) CR 4
Appearing as a small patch of flowers with bluish-white petals, dark sapphire-colored stems, and tiny white leaves growing near the base, winterbloom can be found in cold and temperate climes blooming in the depths of winter. Its slightly sweet scent can be detected 30 feet away, even by creatures without the scent ability.
Disturbing a patch of winterbloom releases a burst of poisonous spores in the form of a bluish-white cloud of chilled vapor. Creatures within 10 feet of the winterbloom must make a DC 12 Fortitude save or sustain 2d4 points of cold damage and 1d4 points of Constitution damage as the inhaled spores form ice crystals on the victim’s lungs. The cloud lingers in the area for 1d3 rounds and each round a creature remains in the area it must make additional Fortitude saves or continue sustaining damage. A patch of winterbloom is easily dispersed with fire.
Cold effects (such as cone of cold) cause the winterbloom to release another burst of spores covering twice the normal area. Continuous assaults with cold effects do not increase its burst beyond 20 feet.
Winterbloom from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene.