When the dialogue was written the armor probably was not designed yet. Someone got the task of designing a shar priest and look at the top of the page: Complete with black circles and Shar tattoo. They could include a roll to recognize her religion. Back to topic: A god returning would be a possibility. But which one? And why does Selune to be absent?
Selune and Shar fusing? But why would they want to do that or need no followers, they already have lots.
Selûne is back as a greater deity post Second Sundering (aka the start of 5e). She shouldn't be absent, her followers deserted the area (or were all killed/corrupted).
Currently in my 2nd PT and what seems to have happened is this:
There is a book at the Tollhouse that mention the following: - The road between Baldur's Gate and Elturel attracted a lots of Selûnites. - They built a temple (became the goblins camp), a village (must be the blighted village) and the Moonrise Towers (toll were paid there, so it must be towers between a road, mountain pass or bridge) - At some point the Selûnites started to act strange, not timeline for this could be after the Dark Justicars showed up or before it. - From the blighted village doctor's journal (in his secret lab) + skeleton with helmet that makes Shadowheart glow, we learn that Dark Justicars came over the village and raided it. - If you save Haslin, we learn that the Dark Justicars went to the Underdark after that, probably following the Selûnites from the temple. With the leader creating a cursed shadow fog around the Moonrise Towers after they failed to take the place?. The druids of the Groves helped fight off the Justicars. - Decades later (couldn't find a year anywhere), the Absolute took residences at the Moonrise Towers and started converting people (aka put tadpole in them).
It's hard to say if the Absolute has a link with the Selûnites or Sharrans, or if someone else just came over after the places were cleaned up by the Justicars...but we know from Haslin that the Justicars disappear one day, a whole army.
