Then you really just buff/mend(you only want three Growths to cap from the Sunlight, along with a tera drain will completely mend you) as necessary and bit by bit nuke it down. It was trivial once the rain is absent and you can tera to deal with the massive shield. https://howtodefeattheraid21627.blogdun.com/21441973/getting-my-how-to-defeat-the-raid-to-work