I find myself surprised that when I showed the other 2 Illusion attempts, I didn't post the final result. Once the player saw the Mesmerist class, he knew that was the class for his Gnome, and all we had to do was remove the parts he didn't like (Stare, which he felt was unthematic for his character), and its children (Painful and Bold), and replace them with Illusion boosts. For the most part, we tried to mirror what existed, so rather than just -2 Will, we did -2 Will vs Illusions (The stare was single target, so it balanced that the illusions weren't, since it was limited to illusions only).
Of note: this was his final character, he's still playing it today (though this is the 2nd time, this time as a Rogue Gestalt), and the most fun for him.
Phantastic Phantasms (Su)
A mystique can use a Full Round Action to cast an Illusion spell rather than a Standard Action. Doing so will allow her to enforce the illusion with more realism, making it more difficult to recognize as an Illusion. Anyone who attempts to disbelieve the illusion suffers a -2 penalty on Will saving throws. This penalty changes to -3 at 8th level. This does not stack with the Spell Focus and Greater Spell Focus feats.
This replaces the Hypnotic Stare class ability.
Phurious Phantasms (Su)
A mystique may cause her illusions to damage to those that interact with them. As a Standard Action, you can draw upon energies from the Plane of Shadow to cause an ongoing figment spell that you created, to damage a foe as if the illusion were real. The target must be both visible to you and within or adjacent to the area of your illusion. You must make a melee touch attack, using your own melee touch attack bonus. If you hit, the target takes an amount of damage equal to 1/2 the mesmerist's class level (minimum 1). Reminder that any such interaction with an illusion is an immediate opportunity to re-roll the saving throw to disbelieve the illusion, even if the attack misses.
This replaces the Painful Stare class ability.
Phorceful Phantasms (Su)
Drawing from the plane of Shadow, the Mystique makes her illusions more solid, capable of physical interaction to the sense of touch.
At 3rd level and every 4 levels thereafter, a mystique's illusions can have further effects. The mystique chooses one option each time he gains a new phorceful phantasm improvement, and the choice cannot be changed later. The mystique cannot choose the same phorceful phantasm improvement more than once unless otherwise noted. All of the mystiques phorceful phantasms improvements affect the target as long as it is affected by an illusion spell of the mystique.
This replaces the Bold Stare class ability.
The Mystique’s illusions gain a small degree of physicality. Creatures attempting to move through the illusion treat the area as difficult terrain. This effect persists even if the creature disbelieves the illusion.
When one of the Mystique’s illusions ends, it persists as a shadowy echo for a number of rounds equal to the Mystique’s Charisma modifier. During this time, the illusion remains visible and solid enough to block line of sight and provide cover, though it cannot move or deal damage.
Creatures that are mindless or immune to mind-affecting effects or illusions are not entirely unaffected. Instead, these creatures receive a +2 bonus on saves to disbelieve and have a 50% chance each round to ignore the illusion’s effects. Ignoring the illusion doesn’t end the illusion, but does allow the creature to act normally for that round.
Grants the Shadow Gambit feat, though when the feat causes damage, the illusion does not end.
The Mystique’s illusions gain enough reinforcement from the Plane of Shadow to affect creatures with blindsight or blindsense. These creatures still perceive the illusion, though they receive a +2 bonus on any saves to disbelieve.
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(NOTE: We only have 5 Bold Stare replacements because we invented them as we played, and there are no more after 20th level, more could be added if ideas are thrown at me).
Anyone who attempts to disbelieve the illusion suffers a -2 penalty on Will saving throws. This penalty changes to -3 at 8th level.
So, I'm not seeing anything really OP about this homebrew, what I do see, is poor wording on the saving throw penalty. As worded, the -2 penalty on wisdom lasts indefinitely, and applies to any other spell cast on them.
it need to be reworded to something like: There is a -2 penalty on Wisdom Saves on Disbelief attempts against this illusion.
Good catch, thank you. :)