Attached to this post is a detailed document which will help you get an overview of the materials you need to craft a legendary ( in this case its the Meteorlogicus). It is in no way a guide to how to get these materials, but a checklist to what you have and what you don’t have already.
I will make more of these if people seem to like em.
Link to the document: https://www.dropbox.com/s/1s0itrrh38nhumd/Meteorlogicus.docx