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Evocation(religion, spiritualism, and occult)
Used in Ceremonial Magic, an evocation is a command, or summons, to a spirit to appear. It differs from an invocation, as used in Wiccan rituals, in that the latter is a request or invitation, not a command.
A spirit evoked by a Ceremonial Magician is summoned into a specially drawn triangle marked with signs and words of power to contain it there. In order to make the spirit appear, the magician must go through a long and elaborate ritual in which the spirit is evoked by words of power, by cajoling, by threats, by calling him by all the many names by which he may be known, and with gestures. It can be a long and draining ritual, and there is no guarantee that the spirit will appear.
The rituals of ceremonial magic are contained in a grimoire, or book of magic, and are usually in Latin, Greek, or a mixture of the two. Various "magical" words from unknown tongues may also be used. The tools used in the conjuring are prepared to detailed instructions given in these grimoires. The practice of evocation is considered extremely dangerous, both by the magicians themselves and by Witches.