SWAMP THING (1986) #163

An increasingly alienated Swamp Thing gets some ominous hints about his future from an eerie group of half-alive Cajun tree-men. Meanwhile, Nightmaster faces what may be his last stand against the warlocks who have destroyed his home dimension. The issue features the various sword and sorcery characters of DC in a story which is completed in the following issue and retcons them to be being mental constructs of Nightmaster. The retconn was poorly received and was ignored by later writers.