Found throughout the plant and animal kingdom, DMT (dimethyltryptamine) is also naturally occurring in humans, where it is released during near-death and actual death experiences, earning it the title “the spirit molecule.” When taken as a psychedelic, either via ayahuasca or in pure form, DMT is experientially considered to be the strongest and strangest of all entheogens. The majority of high-dose users report visions of unknown yet curiously familiar alien worlds and encounters with sentient nonhuman presences. At a four-day symposium at Tyringham Hall in England in 2017, twenty of the world's psychedelic luminaries gathered to discuss entheogenic entity encounters, consciousness expansion, visionary experiences, and the future of research in this field. Contributors to the talks and discussions include many leading thinkers, including the late Ralph Metzner, Chris Bache, Whitley Strieber, Jeffrey Kripal, Angela Voss, Bill Richards, Chris Timmermann, Michael Winkelman, Luis Eduardo Luna, Anton Bilton, Bernard Carr, Daniel Pinchbeck, Dennis McKenna, Ede Frecska, and David Luke. This book distils the potent exchange of ideas that occurred at Tyringham Hall, including discussions on DMT beings, encounter experiences, alien abduction, plant sentience, the shamanic use of ayahuasca, neuroscientific DMT research, the connections between LSD and DMT entities, and the nature of mind and reality.