I believe the base item is crafted through regular means, then you have to synergize that with a particular aptant to turn it into the specialized gear.

Once you have that you have to use synergy and mordant 75 to etch slots into the piece. Then you have to go find an Evolith that will fit into one of the slots, and synergize the two together.

No one bothers with any of that gear anymore though since the evoliths are mostly useless and the gear is outclassed by newer stuff.

Some of it looks pretty cool though.