It's the adolescence. Creepy rural fantasy aside, which is working well too, playing the characters as mid-teens is working wonders.
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Briefly, Cults of Terror is a not merely a landmark in role-playing history, it's a giant. Coupled with the rules it was written to support, RuneQuest 1980, and the supplement that immediately preceded it, Cults of Prax, it established a new-and-different bar for play which defined "I play RuneQuest" into almost its own sector and subculture to the present day.