What was the reason for switching from 4th to 5th? Zoltar 7 years ago Comment from discussion [AMA] Mike Mearls, 5th Edition D&D Lead Designer. Share this: AMA Mike Mearls, 5e D&D May 2017What sort of design choices are intended to add longevity to 5th Edition?What is your favorite published module from any edition of D&D?