‘Unholy’ refers to a finish done by OYY. If I remember correctly, it’s a really thick coat of purple annodization. Apparently the finish is super nice, and super rare as well, probably explaining at least some of the price. An OYY fan could probably give a better run down, though. Found this on FB.
Here’s a pic of an Unholy Echelon (left) and an Unholy Grail (right).
