My fingers itch to start this article with yet another semi-apologetic defense of the use of sub-genres but I'll resist that urge. By now, I'm sure most of you are aware of the way I approach such things and why I find them useful. If you're not, head on over to my Taxonomy of Progressive Metal piece to get a good idea. Funnily enough (or not) we start here as well from Progressive Metal; in this case, we're going to take a look at a vanishing category, a branch in the extensive history of the genre that, somehow, disappeared. That category is progressive death, a style which first flourished in the mid 90's but was then swept away in favor of both revisionism and the laziness that permeates most human interactions. Instead of retaining its clearly distinct and unique attributes and standing out as another pillar within metal, it was somehow sublimated, swallowed into a category with which it had a few conjoining points, consumed like in a weird osmosis.