Good question!:) Well, after the Capella massacre, some (which means many) Vasudans get remained of the Prophecys. They'll never forget Capella, but the Prophecys are very similar to the Capella Apocalypse. Now they gonna say: "Could the Prophecy be right?" And some of them (which means many) just searched for the Hol, found it maybe and then introduced themselves. Then, they should tell other Vasudans where to find the HoL. In the system Barnard's star.
The strength of "my" HoL isn't very heavy, but they're hard to find. And that's their strength. It's very similar to the end of the FS2 with the search of Bosch. The same kind of.
There are more "older" members, but the last leader, who was a pilot as he headed to the HoL, is HoL priest Sukhmet.
Then there's a new leader, called Iris.
And at the very last, to make it clear: Atapeth want to destroy every enemy of the holy planet Vasuda Prime. Also the HoL...
Thank you for your interest.