Just a note here, I believe you have this backwards: "whose true nature belied her charm"Are you saying that her true nature hides her charm? Or are you really saying that her charm hides her true nature? If the former, your wording is correct (but then I would disagree with the truth of the statement). If the the latter then it should be "whose charm belies her true nature."
So..... This thing about 'killing in god's name and clear all impefection', where did i hear it before?........Maybe that's why Blizzard decided to get a bit away from this theme, expecially with the attacks that US received.
Regarding the letter to Zul, it seems it didn't make it to beta. I completed the whole questline and it didn't drop for me.
In Battle for Azeroth, we see the Pride of Azshara in Stormsong Valley, so maybe the remaining seven deadly sins will later make an appearanceThere is seven deadly sins all together. After having seen Wrath and Pride of Azshara, should it read “remaining five deadly sins”?