Outside on Sentinel Island you can now get to the boat in the tree for the treasure that the guy who moved up by the teleporter shrine requested. You may want to use the item yourself, though, rather than complete that quest. There are a few other things to find outside, as well, and possibly a few opponents left to clear. As you move away from the island the poison fog thins, and you can get down to water level.
If you fly out over the water from the start of the fjords, you should see a bunker high in the mountains behind some anti-dragon shields and defenses. That is where you need to get to lower the barrier and disable the shields (there are a couple traders in there, as well, after they surrender).
You can either use a teleporter to get up there (the Camp Sentinel View teleporter, on the west side of the island in the middle of the channel, on a ledge directly above the left Nest Tower as you approach the cliff, will bring you to Camp Eagle's Nest, where you can access the bunker) or it is also possible to fly above the anti-dragon shield and drop down in human form, if you find the right spot.
If you haven't done so already, there are a few places you can clear in the fjords before dropping the barrier, as well (down the mountain path, a couple beaches, the depleted ore mine, etc).
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