Questioner
What is the most Invested item so far revealed?
Brandon Sanderson
What counts as an item?
Questioner
Inanimate object. Sentient swords, stuff like that.
Brandon Sanderson
Okay, inanimate objects, would be Nightblood. Well-- is he inanimate?
Questioner
Well, he's a sentient sword, but he's an inanimate object.
Brandon Sanderson
So, yeah, he would count.