I assume you are still settling into your new 'home' after the intro sequence & fight of ToB.
You'll need to complete a trial, iirc, then you'll be allowed to exit the pocket plane.
You are given only one destination, which is the city under siege by Gromnir (can't remember the name of the city - Saradush?).
You'll be stuck in the city for a little while until you do what needs to be done there. Once you've completed that part, you'll be allowed to access the world map, and you can travel to Watcher's Keep from there - it's located in the NW part of the map.
If you were still in SoA, WK would be at the SW part of the SoA map.
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I visit IW occasionally...
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