Veils

Supernatural portals that exist in Mundana that can transport anyone and anything that travels through it into one the various realms of the Beyonds. Veils come in many varieties, with the two most common types being stable Veils that are premanently fixed in a location and will always take things that travel through them to the same realm in the Beyonds, and unstable Veils that will flicker in and out of existance, move its location in Mundana, transport things that travel through it to random realms in the Beyonds, or several of these things at the same time.