So I had a thought regarding this... with Phantoms being sailors returned from the Sea of the Damned.... couldn't we have them drop the Dark Relics for the order?
As of now every faction has a TON of stuff to turn in: Merchants have crates, animals, explosives, and more... Gold Hoarders have trinkets and chests, Athenas has crates, chests, skulls, explosives, trinkets, etc... But with the Order all we ever do is skulls.
It would make sense for these mystical phantoms to drag back relics from the sea of the damned that they perhaps died with. It's appropriately Mystical and Voodoo-y.
But Phantoms should have a chance to drop something at least I think