Dungeon Shrooms

An unlucky orc - Source

Because of the mysterious energies and vapors that permeate underground complexes, it has been found that inert or dead matter can spontaneously generate life. The most ubiquitous of this is various kinds of mushrooms, that tend to sprout in great number from the remains of living creatures within days or even hours of their death.

When a living creature is slain and abandoned in a dungeon, it will sprout Xd6 (X being the creature's HD) shrooms after 1d6 days if it was an animal, or 1d6 hours if it was a plant. Undead creatures are unaffected.

These shrooms can be harvested and can have different proprieties, decided by a d6:
1 Savory: The mushroom is edible and a delicacy, too! Adding it to a meal will restore 1 HP to those that eat it
2-3 Bland: The mushroom is edible, but bland in favor.
4-5 Unsavory: The mushroom is barely edible, but disgusting, and will spoil the meal it was added to. No HP may be gained from this meal.
6 Poisonous: The mushroom is highly poisonous. After 1d3 rounds of nausea and cramps, who eats it must save vs Poison or die. A successful save means taking 2d6 HP of damage. Sticking two fingers down the throat and vomiting the guts out at the first sign of nausea may count as a successful save. Dried and smoked, the mushroom can be used as a potent hallucinogen.