Now that the Ghostly item effect provides incorporeality rather than concealment, I wanted to see if it stacked with the Ninja Spy Shadow Fade effect. My measurements (156 attacks from a kobold) seem to suggest:
  • They do not stack.
  • Incorporeality is checked before Dodge.
  • Shadow Fade provides a 15% incorporeality bonus.

I had always read that Shadow Fade provided a 25% incorporeality bonus, although I had never personally measured it before.

Can anyone confirm?

Links to older measurements for comparison would also be useful.