I'm working on a planeswalking campaign where the group will be travelling through several different worlds in the Prime Material Plane (i.e. from Toril to Krynn).
I'm using the AD&D Planescape material, although I'm adjusting it to D&D 3.X rules. This assumes that there is just one cosmology, what later would be called the Great Wheel, in which the Prime Material Plane contains all the different worlds -those of the official settings and any it might exist.
Players would travel from one world to another through any of the Transitive Planes (classically the Astral and the Ethereal Planes, although I'm considering using the Shadow Plane as defined in the D&D 3.X Manual of the Planes).
Spelljammer rules might apply, since Planescape considers them.
The question then relates to the influence of the gods to provide spells to priests that travel through different worlds in the Material Plane. So far, I've read the following statements:
- In Planescape Campaign Setting it is stated that limitations will exist when priests travel through the Inner, Transitive and Outer planes, suffering a level penalty to their spells and abilities for each plane between them and their god.
- It is also stated that the Powers (a.k.a gods) can provide their priests with spells in the Prime Material Plane without these limitations.
- In the 'On Hallowed Grounds' book it is stated that powers use to form Pantheons (as defined also in the AD&D Complete Priest Handbook and the D&D 3.X Gods and Demigods) in which each of them will rule over different aspects (their portfolio). In general, gods with the same portfolio will avoid direct conflict among gods from different pantheons.
- It is also stated there that there are Pantheons that are 'sphere-specific', and use to focus on a single World. There, they will be all-mighty, but they are less powerful in the Planes than their peers with a more general outlook.
- There is one final point noted in this book stating that sometimes priests might start a cult to their gods in different planes, eventually receiving the ability to cast spells. This suggests that they may have no spellcasting abilities when they reach a new World.
This final point has me confused. I'm sure I've read somewhere that powers who have no cults on a specific Material World have no influence there, but I cannot find the reference.
So, how does all of this work together? Can gods provide spells to their priests in different Prime Material Worlds? How much influence will they have over a world where said priest is their only follower? Can you point me to the book where this is described?
Also, how would this work on a World so self-absorbed and Pantheon-closed as Krynn?