Zas678 (paraphrased)
Why did Bloody Tan see TenSoon (as the Survivor) and Marsh (as Ironeyes)?
Brandon Sanderson (paraphrased)
He said that he was not answering any questions on what Bloody Tan saw, or thought he saw.
Zas678 (paraphrased)
why does Marsh have a Feruchemical atium spike?
Brandon Sanderson (paraphrased)
You'll have to figure that out! RAFO.
Zas678 (paraphrased)
Do people in the cosmere, besides Nalthis, have Breaths?
Brandon Sanderson (paraphrased)
No. To elaborate a little more, that's not to say they don't have a life force, because they do. But if someone not from Nalthis were to suddenly gain the ability to become an Awakener, they could not use what they have to Awaken something. That's not to say that they can't receive Breaths though.
Finallity
I asked for a generic cosmere clue.
Brandon Sanderson
Hoid has metal he isn't supposed to have.