The second edition of Encyclopedia Cthulhiana contains over a hundred and fifty additional pages and scores of new entries. New features includes thumbnail illustrations of the most important signs and symbols (see sample, left) and a timeline of the Cthulhu Mythos spanning billions of years. Many entries have been revised to reflect our latest understanding of the Mythos, and the infamous Necronomicon appendix has been greatly expanded. Also present for the first time is "A Brief History of the Cthulhu Mythos", which examines the evolution of the genre from the 1920s to today.