I have noticed whilst playing the Blessed Dread three things about Black Arks that seem off;
1) Your admirals do not gain any levels and thus are always level one and quite easy, despite being unbreakable, to slay.
2)Even when you have Lokhir's skill and other skills that buff Lord recruitment - if it is done by a Black Ark, they are only level one. This counts towards agents as well.
3) Black Arks do not replenish in the Dread Expansion stance at sea, yet if you have a friendly army(fleet) in the same ocean then they get replenished - but not the Black Ark.
"Do you know why I use a knife? Guns are too quick. You can't savor all of the little emotions. In... you see, in their last moments people show you who they really are."