John Nelson’s One Style to Rule Them All is an ArcGIS Pro map style that applies fantasy map design elements to real-world geographic data. It does something similar to his earlier (2018) map style, My Precious (described here) only differently and with fewer assets (and 1/60th the download size). John has examples and links to a four-part video tutorial at this ArcGIS Blog post.
Previously: Maps Middle-earth Style: By Hand and by ArcGIS.