It's destination - the Quivering Thumb, a fighting arena where warriors (typically slaves) are pitched against each other to the applause of it's gambling spectators.
The message reads:
I doubt you're truly dead you old dog - wouldn't want to upset that demented bitch and her plans would you?
Your old cloak's been keeping me warm.
I've killed many since our clash - Thanks to your lessons and all those bloody tests.
I've settled in a place north of Baldurs Gate called Roaringshore.
Place is like Westgate - full of raiders, killers and pirates. They now know the name of Garagos because of me.
A war worth bleeding for is on it's way here and I'll use it to spread his name further when it strikes the Sword Coast.
Find me here if you tire of your leash.
Bring your strongest.