There is no key, but there are three windmills you have to blow in to. There will be a map. When the wind is blowing click on the map and it show an x. Go there and it will show you the three wind mills you're supposed to blow into. Blow into the three wind mills and the door will open
You have to do the isle of gust and you`ll get it!
You beat the isle of gust.
in the temple of wind on the isle of gust
on the isle of gust in the north western sea .
you collect the rare materials first and go see zuaz ISLE ABOVE THE ISLE OF GUST
you have to dig near a tree on molida island
in the second temple on isle of gust bottom of northwest sea chart
My friends wont help me.
there is no bomb bag in bannan island. you have to get it on isle of gust
in the northeastern sea next to the isle of gust
Just follow the story.You will eventually find it if you just keep on exploring.
Go to zauzs island (exactly north of the isle of gust EXACTLY NORTH)