Hippiemancy is one of the eight major classes of magic in Erfworld. It is the major class defined by the Life and Matter elements together. Hippiemancy can apparently be used to "quiet" a conflict, though the precise meaning of "quiet" has not been revealed.
The performance of Hippiemancy can affect the participants' perception of time, a phenomenon known as "flaking."
A practitioner of Hippiemancy is called a Hippiemancer.