The Endless Realm is an ongoing series of maps mapping a system of pocket dimensions connected by magical gates. Sages have long argued about exactly why, but these gates fling adventurers onto random planes, resulting in a trip that is never the same twice!
The Basic Pack consists of two transit maps, and two access maps. Access maps are locales used by players to enter or exit the Endless Realm. Transit maps are locales that are found in between the access maps.