How to get on island below Hardhaigh Palace?

For one of quests in Xenoblade Chronicles 2, I need to get to island, which is placed directly below Hardhaigh Palace and its bridge. Yet, I see no way to get there safely. There are no elevators, ladders or any other convenient ways to go down, also no obstacles to prevent death from falling. How can I get down?

Solution 1:

The Fief of Forgetfulness.

To get there, go out of Alba Cavanich to the north, go east down some stairs, and jump down the cliff a bit until you come across a cave. That cave will take you to the location you need for this quest. Note: the cloud tide needs to be low for this to be accessible.