Meigeall
Explorer
This is my draft for ruling how people transition between planes or exist in the veil between them. If you have suggestions, or spot something that is inconsistent with (the Pathfinder version of) the adventure path, please let me know.
For a gradual transition to or from another plane.
0th Ring/Step
You fully exist in your origin plane and have no perception of or influence on your destination plane.
1st Ring/Step
You begin to perceive the destination plane, but it is shrouded (treat as medium fog: -4 perception checks, 1/2 visibility range) while your origin plane is perceived normally.
2nd Ring/Step
Your destination plane becomes easier to see (treat as light fog: -2 perception checks, 3/4 visibility range). You begin to fade from sight on your origin plane (you have concealment). While you are still a solid entity on your origin plane, you are also an incorporeal entity on your destination plane.
3rd Ring/Step
You can perceive both planes normally, but you are invisible and incorporeal on both planes.
4th Ring/Step
You can perceive your destination plane normally, but your origin plane becomes harder to see (treat as light fog: -2 perception checks, 3/4 visibilit range). You are invisible on your origin plane, and become partially visible on your destination plane (you have concealment). You are an incorporeal entity on your origin plane and a solid entity on your destination plane.
5th Ring/Step
Your origin plane is shrouded (treat as medium fog: -4 perception checks, 1/2 visibility range) while your destination plane is perceived normally.
6th Ring/Step
You fully exist in your destination plane and have no perception of or influence on your origin plane.
For a gradual transition to or from another plane.
0th Ring/Step
You fully exist in your origin plane and have no perception of or influence on your destination plane.
1st Ring/Step
You begin to perceive the destination plane, but it is shrouded (treat as medium fog: -4 perception checks, 1/2 visibility range) while your origin plane is perceived normally.
2nd Ring/Step
Your destination plane becomes easier to see (treat as light fog: -2 perception checks, 3/4 visibility range). You begin to fade from sight on your origin plane (you have concealment). While you are still a solid entity on your origin plane, you are also an incorporeal entity on your destination plane.
3rd Ring/Step
You can perceive both planes normally, but you are invisible and incorporeal on both planes.
4th Ring/Step
You can perceive your destination plane normally, but your origin plane becomes harder to see (treat as light fog: -2 perception checks, 3/4 visibilit range). You are invisible on your origin plane, and become partially visible on your destination plane (you have concealment). You are an incorporeal entity on your origin plane and a solid entity on your destination plane.
5th Ring/Step
Your origin plane is shrouded (treat as medium fog: -4 perception checks, 1/2 visibility range) while your destination plane is perceived normally.
6th Ring/Step
You fully exist in your destination plane and have no perception of or influence on your origin plane.