Planescape - Dead Gods
Sigil and Beyond.
The city at the center of the Multiverse, the Cage, The City of Doors. This is where you are now, not by choice but better make best of it, hey?
Through Sigil you can reach almost any place you desire, if only you find the right portal and the right key to it.
Here you will find a sliver of information regarding the great Multiverse, about Sigil and the Great Ring, the Outer Planes, Inner Planes, Prime worlds, Elemental planes and the space between.
The Factions that make up the politics of the Multiverse, the Blood War, the Gate Towns…. everything and yet nothing. Information is power they say, they got that right.