Quote Originally Posted by Malimar View Post
To clarify, you can sail between Krynn and Toril and Eberron and so on on a spelljammer, yes?
Correct. Astrogation only. Water won't do.

Also you can't use spells to teleport directly from one Crystal Sphere to another, because phlogiston blocks teleportation. Yes?
This one's constantly in a gray area, since teleport employs the Astral Plane to get around... in theory you should be able to, but the general understanding is that crystal spheres impede "addressing" somehow for teleportation effects that didn't originate within them. This may be a property set by the local supernatural muckymucks to keep out the come-from-aways. If that makes sense.