One thing Tresspasser never cleared up for me is why spirits and demons couldn’t explain everything to future generations. Surely some academic mage or historical scholar would wanna interview a spirit of wisdom about the fall of Arlathan.
Come to think of it, somebody should have accounts about the time before the Veil. Dalish elves can remember they used to be immortal, but not that this barrier keeping the Fade back is new? Surely Tevinter would have kept records on this stuff, or there would be something in the dwarven Memories.