Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
I'd save myself the headache and go use the setting guide template, ala Eberron and Wildemount.
I would have a chapter on Sigil and the different planes and a chapter refluffing the sea adventure rules from Saltmarsh for SPACE!, for those who like the concept of Spelljammer or Astral skiff.
What I would NOT have is a 1000 pages long essay on the cosmology that tries to make sense of it all. Give us the rules and descriptions of the planar cool spots, and let the DM decide how it is all connected. Do not try to create a ''realistic'' canon: people will rage because it doest not fit their vision, touch their precious Eberron/Darksun/MTG canon and will be a confusing mess if they try to merge all previous planar theories.
Maybe add planar templates based on the supernatural gifts to create ''plante-touched'' races like the Tanaruk, Planescape Tiefling, Elemental touched races etc. (IMHO you dont need to have 100 unique variation of ''has fiendish blood'' as player races).
I would have a chapter on Sigil and the different planes and a chapter refluffing the sea adventure rules from Saltmarsh for SPACE!, for those who like the concept of Spelljammer or Astral skiff.
What I would NOT have is a 1000 pages long essay on the cosmology that tries to make sense of it all. Give us the rules and descriptions of the planar cool spots, and let the DM decide how it is all connected. Do not try to create a ''realistic'' canon: people will rage because it doest not fit their vision, touch their precious Eberron/Darksun/MTG canon and will be a confusing mess if they try to merge all previous planar theories.
Maybe add planar templates based on the supernatural gifts to create ''plante-touched'' races like the Tanaruk, Planescape Tiefling, Elemental touched races etc. (IMHO you dont need to have 100 unique variation of ''has fiendish blood'' as player races).