So I think that Virtuosity isn’t a spoiler; it’s like 20 pages into the book, and it’s just mentioned in passing. If it is, sorry. Anyways, with the idea that the last Shard wants to stay away from the rest of the Cosmere, but is beginning to think that this isn’t the best path. Additionally the last Shard may be the opposite of Virtuosity, as art is not always practical. So with that out of the way, I believe that the name of the last Shard is ‘Practicality’.