Sazed's note

A note that Sazed left on the back of the flower picture of Kelsier's.

It is addressed to Spook and mentions Kelsier, Goradel, Rashek, Ruin and the rest of Kelsier's crew. The first paragraph talks about Vin and Elend, and it is revealed that there are 2 extra metals, Bendalloy and Cadmium, yet to be discovered.

“Spook, I tried to bring them back, but apparently fixing the bodies doesn't return the souls.

I will get better at this with time, I expect. However, be assured that I have spoken with our friends, and they are quite happy where they are. They deserve a rest, I think.
The book contains a short record of the events that led up to the world dying and being reborn, along with some musings I have made about the history, philosophy, and science of recent occurrences. If you look to your right, you will find a much larger group of books in the grass. These contain all of the knowledge–repeated verbatim–that was contained in my metalminds. Let the knowledge of the past not be forgotten.
Rebuilding will be difficult, I think–but likely far easier than living beneath the Lord Ruler or surviving Ruin's attempt to destroy the world. I think you'll be surprised at the number of people who fled to the storage caverns. Rashek planned very well for this day. He suffered much beneath Ruin's hand, but he was a good man, who ultimately had honorable intentions.
You did well. Know that the message you sent via Captain Goradel saved us all, in the end. The people will need leadership in the years to come. Likely, they will look to you. I'm sorry that I cannot be there in person to help you, but know that I am...about.
I have made you Mistborn, and healed the damage you did to your body by flaring tin so much. I hope you don't mind. It was Kelsier's request, actually. Consider it a parting gift from him.
Watch over them for me.
P.S. There are still two metals that nobody knows about. You might want to poke about and see if you can figure out what they are.

I think they'll interest you.”

—Sazed's note