Tiny cone with tiny mushrooms resting on the cap of a russula mushroom...

Amanita pantherina,  also known as the panther cap, false blusher, or panther amanita is commonly found in Europe and Western Asia. 

Like many amanitae, it contains psychoactive agents (ibotenic acid and muscimol) but is also considered toxic. Eaten raw it can cause severe illness such as diarrhea, vomiting, hyperhidrosis, cramps, severe dehydration, reddening of the skin, coma, or even death by respiratory paralysis.

100 g of fresh pantherina may contain a fatal dose of ibotenic acid (38 mg per 1kg of body weight). 

Indigenous peoples in Siberia have been known to use it as part of initiation rites, for which they used to dry the mushroom for a longer period of time. The longer it dries, the ibotenic acid will turn into muscimol, which is less toxic but more hallucinogenic. Still, the content of toxins vary in each mushroom, so experiments are not recommended.