First of all, I think the prefix "mega" is unnecessary and has done harm to the artform of what I'll call instead a tentpole dungeon. It conjures images of 600 page tomes with long room keys that are off-putting to read and play. What we call megadungeons used to just simply be referred to as "dungeons", a setting for a campaign which, due to its ever-changing and expanding nature, holds capacity for infinite play.
