This item drops from Ancient Guardian post revamp Chardok.
https://wiki.project1999.com/Ancient_Guardian
I can confirm it did in fact drop as recently as about a month ago.
(edit: I would have to dig in logs for the precise date it may have been 2 months ago now. also super super rare 100+ kills and only saw this once so far and I have spent much time in Chardok pre and post revamp)
jaladiun/jaladian/vekter