Orobas Fjords?
After you take over the Battle Tower you can still go to all places in the Orobas Fjords
But look into your Logbook to see if there're still quests to do ! Only 1 or 2 quests you can accept in Broken Valley or Sentinel Island you can solve them only AFTER take over the BT !
The names of both quests are :
"Legend Of The Ancient Mariner" : Turgoyn give this at Sentinel Island .
"A Guild without a Master" : William give you in the Tower by the Mine (nearby the Quary Scrine in Broken Valley!)
So if you see other quests unsolved, go back to Broken Valley or Sentinel Island .
But a note about the Mine Tower :
in the last version (DKS), you CAN'T going in this Tower (level 27 Black Rings!), so that quest for William is always
afterDamian poisoned Broken Valley and Sentinel Island with poisonous gaz !
Good luck !