@SilvaThere is a WoB which states that one could spike attributes from a spren. This for instance:
Questioner
So, the fan page wanted to know. Would it be possible for Hemalurgy to steal a living Shardblade? That was the top voted question.
Brandon Sanderson
Ok, so you're bonded to a Shardblade. You get spiked, then they spike off the bond so that the Shardblade is bonded to someone else.
Questioner
I assume so...
Brandon Sanderson
But can they do it with a living Shardblade? You can definitely do it with a dead Shardblade because its just stealing the Connection. With a living Shardblade, yes you could do that 'though the spren could break the bind at will.
Questioner
So the spren would survive? That was the second-- the corollary--
Brandon Sanderson
Ehhh. Would the spren survive? The spren would survive as long as the oaths were--
Questioner
Intact?
Brandon Sanderson
--the person didn't break the oaths. But you could theoretically steal the bond, break the oaths, and kill the spren. If you wanted to. Its a very convoluted to kill a spren, they are easier to kill than that, but yes. You could do that. That is a viable but twisted route that you can do. You would end up with a dead spren and a Shardblade, so there is that. But there are easier ways to accomplish that...
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or this:
Mr. Suit
Can spren - like Syl - be pierced by hemalurgic spike? Will it give some effect?
Brandon Sanderson
Yes. A spren can be pierced by Invested metal…
Oversleep
Could it be spiked?
Brandon Sanderson
Could a spike be used to give abilities to spren? That’s not going to work really well.
Oversleep
Could you steal from a spren?
Brandon Sanderson
Yes, you could steal the Investiture of a spren. Any Investiture can be used in a spike if you know what you’re doing. It’s actually not that hard to use one on a spren.
Oversleep
Because I thought you said Hemalurgy needs moving blood.
Brandon Sanderson
It needs, uh, yeah… there are places where spren have more physical form, more tangible form.
Questioner
Roshar?
Brandon Sanderson
No, no, no, not Roshar.
Questioner
The Cognitive Realm on Roshar?
Brandon Sanderson
Yeah, if you go to the Cognitive Realm on Roshar the spren act differently than they do.
Oversleep
So you could spike in the Cognitive Realm?
Brandon Sanderson
Yeah I’ll leave a RAFO with you on that. That’s your fifth one. So there are ways to get any Investiture into Hemalurgy if you know what you’re doing. But yeah this is not something that would be a common use for Hemalurgy. Let’s just say that.
Oversleep
We do not concern ourselves with common uses.
Brandon Sanderson
Yes, I know you don’t. But yeah Hemalurgy, when you’re spiking into somebody you… you’ll see when we get around to it.
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