Quote Originally Posted by Vaern View Post
In Terry Pratchett's Mort, Death is described as being able to pass through walls not because he is incorporeal or anything like that, but rather because he is simply more real than the world around him and thus solid objects yield to him as he wills it. Nothing is more real than Death, after all.

Anyway, if you want to throw a twist on things being more than 100% real, make the super-real illusions act as though real creatures and objects were quasi-real illusions. A 120% real summoned creatures deals full normal damage as a normal creature would, but if attacked by a regular character it only takes 80% damage because that character is less real than the illusion.
This already has representation within the text.

Quote Originally Posted by Samael Morgenst View Post
Shadow conjurations are actually one-fifth (20%) as strong as the real things, though creatures who believe the shadow conjurations to be real are affected by them at full strength.

[...]

A shadow creature has one-fifth the hit points of a normal creature of its kind (regardless of whether it’s recognized as shadowy). It deals normal damage and has all normal abilities and weaknesses. Against a creature that recognizes it as a shadow creature, however, the shadow creature’s damage is one-fifth (20%) normal, and all special abilities that do not deal lethal damage are only 20% likely to work. (Roll for each use and each affected character separately.) Furthermore, the shadow creature’s AC bonuses are one-fifth as large.
Basically, if the shadow summon is affecting someone else, that person is affected by whichever percentage they believe in (either 100%, or the base 20% if they successfully disbelieve). If someone else is trying to affect the shadow summon (at least with damage), the shadow summon has 20% normal hit points.

If you cranked up pseudoreality to, say, 200% somehow, and summoned an illusory Hell Hound, it's bite attack would deal 1d8+1 dmg (average 5.5 to most people, or 11 to people who disbelieve), but it would have 44 HP regardless of whether people believed in it or not. Being 200% real gives it 200% normal HP, which is roughly equivalent to the kind of thing you're suggesting.