I thought you had Metus? Her skeleton tokens should be a good lightning rod for the tengus. There're two of them that throw the lightning spears. Here's how I did mine with thief:
It took me three tries to get used to the difficulty increase. Idk what units you have, but I guess you could replace Ashela with Claire or Bashira, AW Prince with a good tank (Bernice, Julius, Hibari), Mikoto for Kokoro, Kokoro for a witch, Nezha for Metus since both have true damage. If you can't do it, I guess follow this guide:
https://www.youtube.com/watch?v=7fqXkaZKDVM. You should focus on AWing some of the more core units like Miruno and whatever black units you have.