Rysn travels with Chiri Chiri on her ship Wandersail to Aimia. And really, you just need to read and find out what happens because once again, Sanderson has made the impossible possible!
I loved this short story. It was heartwarming and full of fun characters that I love reading about, particularly The Lopen. I highly recommend this, especially to be read between Oathbringer and Rhythm of War.