Dried leaves of the Salvia Divinorum plant. Psychonauts either smoke or ingest the leaves, which produces an intense psychedelic experience. The experience can be far more intense than LSD, Psylocybin, or other common hallucinogens - total loss of identity is common, along with total loss of reality and environment
I though Salvia was a crock, and bought some out of curiosity. I ended up thinking that the Simpsons were in on my experience, and a few seconds later - had no idea who I was, or that I even had a body - it was like I became an entity of some kind. During the experience I had no idea that it was the result of smoking salvia. You literally go to a different place, and have no idea that your'e on a temporary trip. It's pretty scary, and I dont ever want to do it again.