“ Wondrous Carrier Pigeon> Is capable of transporting up to 1 pound of material over any distance after a recipient is named. Will take 1 week to get anywhere on a single plane.In addition to messages, an enterprising Amazon alchemist has a vibrant delivery service”
“ When you sleep, your soul briefly returns to the place where it was created/goes to when it dies, and seeks nourishment. Everybody's soul is created with a little link (or you could say a greater entity calls it back) to that place so that it can return easily, but upon death, the soul returns via that and annihilates the link as if returns.
Also, as an added thingy, you could say the entity supplying the link, or residue of the links themselves, (whichever) is the source of all arcane power.”