Am I missing somthing?

[BubblesTheCat]

Is everyone else as confused as I am about the 17th shard and where the crap it mentions it. The only book that mentions the 17th shard is Mistborn Secret History, but some how there are members of it in a lot of books that I only learned about from The Coppermind. If someone could explain everything that would be great.

[Chaos he/him]

Hopefully this page helps: https://www.17thshard.com/about.php

Short version, Brandon told us this name a bit prior to Way of Kings, which is where the name "Seventeenth Shard" first canonically appeared.