Well see that's the thing: my character is basically using a Talisman of Soul-eating to collect souls for a very dear 'friend' of mine (a horned devil no less), and we recently ended up fighting a horde of Proteans (This is actually from the Legacy of Fire campaign).
Anyway, once we killed the leader of the Proteans (the 'chick' named Lahapraset), I decided to use my talisman to take her soul.
But of course, the question obviously came up: can you take the soul of a dead outsider? Again, because an outsider's body and soul are 'one', then it kinda made my group scratch their heads in confusion. We decided to let it slide for now, and thus far I haven't found anything to say that you "can't" use the talisman (or the Create Soul Gem spell) on outsiders (as the requirement only seems to be that the target is a 'sentient creatures' who possess a soul...so obviously no constructs or 'mindless' undead unless said creatures specifically say that they do in fact have souls).
Anyone else have any other thoughts.
I guess the real question is: what kind of creatures actually have souls (and if said creature does have a soul, is it actually possible to steal it with a Talisman of soul-eating or a Create Soul Gem spell)?