Arras was created “back in the day” by Melvin Lee. For a while in the early days of WordPress themes it was one of the top 10 themes on the WordPress.org theme repository. When Melvin discontinued development the theme was removed from the WordPress repository.
I had a client that used the theme and so began patching it together. Over the past several years, I’ve experimented with taking it in various directions, some more successful than others.
As of December, 2018 and WordPress 5.0 I am no longer developing the Arras Theme, and I have not run any tests of the theme with WP 5.0+. For those who wish to attempt it, you are more than welcome to fork the Source code.