Timmask

Timmask was a fungus that grew in the Underdark. It was known colloquially as "the devil's mushroom".

Description
Timmask was a squat toadstool that grew to a height of about two feet (60 centimeters). It had a beige-colored cap that was crossed with red and orange stripes. If it was heavily damaged or killed by uprooting, it spewed a cloud of spoors out to a radius of 15 ft (4.6 m). All those within the cloud were poisoned for about a minute unless their constitution was sufficient to shake off the effects of the spores. Those who failed to resist acted like they were under the influence of a confusion spell until it wore off.