Nilhogg’s Nose. A Nilhogg’s nose is a small mushroom that grants any creature that eats it advantage on Wisdom (Perception) checks based on smell for 1d4 hours. However, the creature suffers disadvantage on saving throws against effects based on smell for the same amount of time.

Olisuba Leaf. These dried leaves of the Olisuba tree, when steeped to make a tea, can help a body recover from strenuous activity. If you drink a dose of Olisuba tea during a long rest, your exhaustion level is reduced by 2 instead of 1 at the end of that long rest.

Ormu. A bioluminescent green moss that grows in warm and damp areas, ormu is particularly common near steam tunnels and vents. It sheds dim light in a 5-foot radius, and can be harvested, dried, and made into a phosphorescent powder or pigment.

Ripplebark. Ripplebark is a shelf-like fungus that resembles a mass of rotting flesh. It is surprisingly edible. Though it can be eaten raw, it tastes better roasted. A single sheet of ripplebark yields 1d4 + 6 pounds of food.

Ryath Root. Any creature that ingests a ryath root gains 2d4 temporary hit points. A creature that consumes more than one ryath root in a 24-hour period must succeed on a DC 13 Constitution saving throw or suffer the poisoned condition for 1 hour.

Sinda Berries. These berries are dark brown and bitter. A full-grown sinda berry bush has 4d6 berries growing on it. A bush plucked of all its berries grows new berries in 1d4 months. Picked berries lose their freshness and efficacy after 24 hours.

Fresh sinda berries can be eaten raw or crushed and added to a drink to dull the bitterness. A creature that consumes at least ten fresh sinda berries gains advantage on saving throws against disease and poison for the next 24 hours.

Soothsalts. The crimson crystals have been mined from cavernous veins like those in the mouth of the Miskath Pit and found within smaller geode formations near sites ravaged by the Calamity. Soothsalts are consumed orally in lozenge-sized doses, and frequent users can be identified by the telltale crimson stain around their mouths. A creature subjected to a dose of soothsalts gains advantage on all Intelligence checks for 1d4 hours.

For each dose of soothsalts consumed, the creature must succeed on a DC 15 Constitution saving throw or gain one level of exhaustion—an effect which is cumulative with multiple doses.

Theki Root. This thick marsh root tastes bitter but is thought to aid digestive health. When you use an action to consume a dose, you gain advantage on saving throws against the effects of poisonous or toxic substances for 8 hours.

Timmask. Also known as “the devil’s mushroom,” a timmask is a two-foot-tall toadstool with orange and red stripes across its beige cap. Uprooting or destroying a timmask causes it to expel a 15-foot-radius cloud of poisonous spores. Creatures in the area must succeed at a DC 14 Constitution saving throw or be poisoned. While poisoned in this way, the creature is under the effect of a confusion spell with a duration of 1 minute. When the spell effect ends, the poisoned condition also ends.

Tongue of Madness. Tongue of madness is an edible fungus that looks somewhat like a large human tongue. A creature that eats a tongue of madness must succeed on a DC 12 Constitution saving throw or compulsively speak aloud its every thought for the next hour. The effect can be ended with a lesser restoration spell or similar magic.

Torchstalk. A one- to two-foot-tall mushroom with a combustible cap, a single torchstalk burns for 24 hours once lit. There is a 1-in-6 chance that a torchstalk explodes when lit, bursting into a cloud of fiery spores. Creatures within 10 feet of an exploding torchstalk take 3 (1d6) fire damage.

Trilimac. A trillimac is a mushroom that grows to a height of four to five feet, and has a broad gray-green cap and a light gray stalk. The cap’s leathery surface can be cut and cleaned for use in making maps, hats, and scrolls (its surface takes on dyes and inks well). The stalk can be cleaned, soaked in water for an hour, then dried to make a palatable food akin to bread. Each trillimac stalk provides 1d6 + 4 pounds of food.

Waterorb. A waterorb is a bulbous fungus that grows in shallow water. A mature waterorb can be squeezed like a sponge, yielding a gallon of drinkable water and a pound of edible (if chewy and somewhat tasteless) food.

Wildroot. Introducing the juice of a wildroot into a poisoned creature's bloodstream (for example, by rubbing it on an open wound) rids the creature of the poisoned condition. Once used in this way, a wildroot loses this property.

Willowshade Oil. A dark blue oil can be extracted from the rare fruit of the willowshade plant. A creature can use its action to apply the oil to another creature that has been petrified for less than 1 minute, causing the petrified condition on that creature to end at the start of what would be that creature's next turn.

Wukka Nut. These fist-sized nuts grow on wukka trees, which are popular haunts for jaculi, su-monsters, and zorbos. A wukka nut rattles when shaken, causing its shell to shed bright light in a 10-foot radius and dim light for an additional 10 feet. This magical light fades after 1 minute, but shaking the nut again causes the light to reappear. If the shell of the nut is cracked open, it loses its magic.

Zabou. Zabou mushrooms feed on offal and the rotting wood of dead trees. If handled carefully, a zabou can be picked or uprooted without causing it to release its spores. If crushed or struck, a zabou releases its spores in a 10-foot-radius sphere. A zabou can also be hurled up to 30 feet away or dropped like a grenade, releasing its cloud of spores on impact. Any creature in that area must succeed on a DC 10 Constitution saving throw or be poisoned for 1 minute. The poisoned creature's skin itches for the duration. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Zurkhwood. Zurkhwood is a massive mushroom that can reach a height of thirty to forty feet. Its large grain-like spores are edible and nutritionally equivalent to 1d4 + 4 pounds of food, but zurkhwood is more important for its hard and woody stalks. Zurkhwood is one of the few sources of timber in the Underdark, used to make furniture, containers, bridges, and rafts, among other things. Skilled crafters can use stains, sanding, and polishing to bring out different patterns in zurkhwood.