When a gas spore encounters a living creature, it injects poisonous rhizomes into the foe if that opponent fails a Fortitude save. Each day thereafter, an infected creature must succeed on a Fortitude save or take Constitution damage. At Constitution 0, the victim dies and 2d4 gas spores emerge from its body. A remove disease spell cast on affected creature before it dies destroys the rhizomes and prevents any further Constitution damage.
If a gas spore is struck for a single point of damage, it explodes in a violent blast of gas that deals 6d6 points of damage to all creatures within a 30-foot radius (DC 15 Reflex save for half damage).
Gas Spore (CR 4)
Section 15: Copyright Notice – Tome of Horrors Complete
Gas Spore from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene and Clark Peterson, based on original material by Gary Gygax.