Can I use the Planar Handbook, Manual of the Planes, and Deities & Demigods in an Urban Arcana campaign?
Knock yourself out. There’s no reason you can’t incorporate the planar cosmology and even the gods from the D&D game into an Urban Arcana campaign. In fact, Manual of the Planes explains that the Plane of Shadow is rumored to connect different alternate Material Planes. One of these could be the Material Plane that holds the world of Urban Arcana, and another could be the Material Plane where all the shadowkind originated. You could even build a group of planeswalkers who have been exploring planar magic in an attempt to discover the place beyond Shadow where all the magic in the world originated. Deities and Demigods is also a great resource for any campaign that incorporates real-world mythology. An adventure in which minions of Set are chasing the PCs while they try to rescue a valkyrie held captive in the plane of Hades would be a bit mind-blowing, but I bet it would be fun! I was wondering about epic-level progressions for the classes and advanced classes in the d20 Modern Rolepla
