I just got to Orobas Fjords and I am level 21 but cannot handle the dragon fights,

the nesting towers breed loads of foes very quickly, and they are covered in some kind of red shields that I cannot penetrate. I don't understand how I am supposed to take them down.

This is not like in the first flying mission. Every time I attack the nesting towers I just get slaughtered.

What do I do?

Thank you