How do I shut down antidragon zones in orobis fjords?

First off, it should be known that not all anti-dragon zone shields can be taken down.

So, to take down the barriers in the beginning, starting from the first waterfall you see in Orobas Fjords, hug the cliff on the left and head towards the nest under the barrier on the left. Fly across it and on the cliff above it you will see a teleporter. Use the teleport you are after. It will take you to a bunker in the anti-dragon zone. Enter the bunker and fight two members of the Black Ring. After you have defeated them, go up the stairs; decide the fate of two more Black Ring warriors, before going to the end of the bunker and interacting with three levers. This will remove all the Dragon Barriers in the beginning.

Now, the barrier surrounding the small towns, you cannot remove.

To remove the anti-dragon shields at the far end of the Fjords, you will need to destroy certain goblin constructions. These constructions are illuminated by a blue energy force surrounding them. You will need to destroy them to bring down the barriers. Using fireball is a great tool for destroying them.