Cover Art of Hellblazer (1988) #56.
*Constantine paid for Newcastle with a stay in Ravenscar Secure Facility for the Dangerously Deranged. After two years he was released, stripped of his arrogant illusions. He patiently cultivated arcane knowledge, occult contacts and a network of castoffs who might someday be of use. One of these was Swamp Thing, who could be manipulated in exchange for information concerning his true nature. Constantine used him to stop the Brujeria, a circle of conniving witches. In the end, Swamp Thing proved atypical of those who have been manipulated by Constantine; he survived the experience.*Source: Back of card