And Caverns Old
We now have a hex map of the local region for creating our campaign, but no where for our adventuring party to loot treasure and rout evil. So we need to start creating our centerpiece dungeon~ exciting! The party may venture off to other oneshot-type escapades, but this dungeon needs to last a while. As we get into it, let's go over some quick terminology.
In a classic Gygaxian campaign, these focal dungeons are common: His personal Castle Greyhawk, the namesake for the Campaign setting in which the Castle resides; Temple of Elemental Evil from…Temple of Elemental Evil; or my personal favorite, the crashed UFO from Expedition to Barrier Peaks. Each of these is an archetypal dungeon that a campaign can be focused around. They are also often referred to as Mega-dungeons.