Pagerunner
The Hemalurgy table, you wrote down "atium steals any power, lerasium is all abilities, nicrosil is Investiture"; what's the difference between those three?
Hemalurgic atium, lerasium, and nicrosil. What's powers, abilities, and Investiture?
Brandon Sanderson
People are Invested in ways that do not give them active powers. So for instance, everyone on Nalthis is Invested. Everyone in the cosmere is, really. You want to steal their Investiture, but they don't have a power. You're still ripping off a piece of their soul. So there is a distinction between the actual Investiture that's in a human being and a specific power that they have.
So that distinction is pretty easy. You can also, with Hemalurgy, steal specific things. You can steal just general Investiture. You can steal, if you want--this is where the kandra Blessings come from. You can instead steal specific things that are not like stealing Allomancy. Stealing, for instance, someone's mental acuity.
Pagerunner
So abilities is like the half that's all the strength, speed, all that kind of stuff? Those are abilities, versus the Metallic Arts are all powers?
Brandon Sanderson
Yes.
Pagerunner
Then Investiture, is that offworld magics?
Brandon Sanderson
No, no, it's the raw power.
Pagerunner
Nicrosil is their soul?
Brandon Sanderson
Yes. A piece of their soul, essentially.
Pagerunner
So how would you go about stealing an offworld power?
Brandon Sanderson
It's going to depend. A Breath, you would steal with nicrosil. It's general Investiture, is what you would probably going call that. You could forcibly remove someone's Breath from them. The ability to be a Sand Master you would steal with the power ability.