Originally Posted by
YianKutku
That's why I mentioned Pandemonium in my first post, though: if it was a case of Convocation members having their staff or subordinates wear black masks, the most likely person to wear one would be Erichthonios, since he's explicitly a member of Lahabrea's staff, under Lahabrea in the org chart. And yet he wears a white mask, or at least has one hanging on his robe, with no indication that there was ever a black mask in his wardrobe.
And the other member of Pandemonium (and thus part of the Words Of Lahabrea), Hesperos, wears a white mask in flashback. I'm willing to place less importance on Hesperos, given he wears no mask at all when we confront him, and by that time he has clearly gone off the deep end. But that does not explain Erichthonios.