Did someone noticed that the Dark seems tied to Womens ?
The Mage outfits, black and white, are each designed to be worn by women mages and men mages... black, being the female robe.
Nashandra, a shard of Manus, is a woman.
Elena, another shard of Manus, is another woman.
Gwyndolin, of the Dark Sun, is the leader of the Darkmoon covenent and was raised as female.
In many cultures, the Moon is a symbol of women. The Yin, black half of the Yin/Yang circle, represent the female half of humanity.
On the opposite end, we have the white mage robe, worn by male mages.
Gwynn, Lord of Sunlight.
Vendrick, King of Drangleic, have a golden throne in his castle.
Of course, this could be only minor lore, but it could be important.
Hmm, I don't know, maybe it's some form of clue as to the true nature of the leaders of the kingdom? They are the robes of Drangleic mages specifically, perhaps representing the king (white robes for the king who would light the flame) and the queen (black robes that represent the queen's dark nature).
As for Gwyndolin, yes he was raised as a woman but he is allied with Frampt in a way due to him creating the illusion of sunlight and of his sister to fool the undead in to thinking that relighting the flame and continuing the age of fire is the correct course of action. His army of Darkmoon Blades hunt down those who would break this illusion and his plans.