What Constitutes A Physical Attack...

[Pbartender]

...with regards to Physical Immunity?

Is it just anything that would cause physical (rather than mental or social) stress with a successful attack?

[Tedronai]

Yes.

[Pbartender]

Yes.

Thanks...  That's what I thought.

[Sanctaphrax]

I think PI works against things that aren't attacks, too. If there are any such things. It's basically Infinite Toughness.

[Tedronai]

I think PI works against things that aren't attacks, too. If there are any such things. It's basically Infinite Toughness.

Things that result in physical stress or consequences.
Which, 99.9...% of the time, are (at least adjudicated as) attacks of one sort or another.

If it doesn't result in physical stress or consequences, then PI doesn't interact with it, though there might sometimes be a justification to invoke-for-effect the aspect related to PI to render the character immune to a non-stress/consequence-inducing effect of another sort (a block created by a barrage of bullets, or zone border created by a wall of fire, etc.).

[Sanctaphrax]

Yeah, I was trying to say something like that.

Sorry if it wasn't clear.

[mstorer3772]

It also ought to cancel out some maneuver-based aspects that might be applied to the monster that has it.  It depends entirely on the maneuver.

[Tedronai]

It also ought to cancel out some maneuver-based aspects that might be applied to the monster that has it.  It depends entirely on the maneuver.

See YS's comments regarding seemingly-contradictory aspects.