Something that I hope Deadfire will help settle (or at least provide enough clues to make sense of the backstory):
Just how does Engwith's backstory flow? It occurred to me while compiling the story of the Endless Paths:
https://pillarsofeternity.gamepedia.com/Endless_Paths_of_Od_Nua
All sources, including Cabiros and Od Nua, state that the fall of the keep occurred two thousand years before present day. Given the interactions with the spirits and the general reverence Od Nua's Children of the Wheel show, it's safe to assume that Thaos' grand social experiment was not in motion