A peyote dream runner was a Native American who was used to psychically transmit messages.
Using a combination of drugs, the runner would enter a dream state where their astral self could travel free of their body. They would "run" with a message, often able to deliver it to several places almost simultaneously. An anchorman would be with them to maintain the connection between the physical and astral bodies. During one of the ceremonies, Cousin Belial saw what happened if that connection was lost and wrote about it in his journal. (PROSE: The Book of the War)