[3.5] Making Invisible Spell less broken

[Starbuck_II]

I do think that things like "Invisible Fog Cloud" are reasonable ways to hamper See Invis and True Seeing.

I would prefer "creatures able to see the invisible ignore the effects of this metamagic effect"

Thus, an 'invisible Silent image' would be treated as a normal 'Silent image' to someone with true seeing. They would then see through it.

That is how it works. Trueseer can see though a silent image even with this metamagic. But See Invisiblers can't.
True seeing can't see through Fog Cloud so Invisible becomes a great tool vs Trueseers (since everyone else can see through the Cloud).