ST205 Constantine, Magic and the Occult
The Summoning: magic as practice
The seance of #49, what it shows magic to be, and who pays for it.
Reading for this lesson
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Recommended The Saga of the Swamp Thing #50: "The End" Alan Moore (writer), Stephen Bissette, John Totleben and Rick Veitch (art) the first six pages
For where the seance leads.