I write this letter in haste, for many great tasks are at hand, and I have been long away. I make for Rohan this very moment, and you should ride there with all the speed you can muster.
I cannot see the future, but I know you will be sorely needed in that land before the end. If you befriend the horse-lords there, they will likely gift you with one of their own great steeds.
You will need a new steed, you see. War is coming.