Lady Radagu
If Shai were to gain a Shardblade and she gave it up, could she then create an Essence Mark that represented the history where she still had the blade? And then if she applied it could she summon the blade? Or a copy of it?
Brandon Sanderson
Okay, so doing that sort of thing, like re-writing herself to be an Allomancer or something like this -- This is possible but in order to gain the Investiture she wants to have she will have to input that much in Investiture which her current magic system is not capable of doing. Okay? Alright, so "re-write so that I have a Shardblade" would require some sort of hacking of her magic system, which is currently impossible to her in her current situation.
Lady Radagu
So if she had had a Shardblade and gave it up she could not rewrite herself to have that back without more input --
Brandon Sanderson
She could-- Yes, exactly. Now rewriting-- That would be a lot easier than just rewriting herself so that she had a Shardblade--
Lady Radagu
That's what I was asking--
Brandon Sanderson
Yeah, but what you're asking about would be much easier and that is probably within her power. But what that would do is-- Yeah that's totally within her power. It would create some weird implications where she's summoning it and someone summons it back from her because the Shardblade thinks it's owned by two people.
Lady Radagu
So it wouldn't be a copy it would be the same Blade?
Brandon Sanderson
Yes.