This is probably one of the obvious, and cliche answer. I'd still go with it, though, as it fitting my Warden most. My Aeducan would see his father Endrin on his death bed, blaming him for his failure, and say that he's a disgrace to Aeducan's name. Then he would see Orzammar falling apart, and his people slowly die out after a years of siege, the Darkspawn finally break into the city and kill every Dwarves, but spare the last dwarf, who's a women, only to turn her into a Broodmother that would spawn a relentless wave of twisted being that mirroring his people swarming him. In his nightmare the surface civilizations not only refuse to help Orzammar, but seal its gate tight so no darkspawn, and even dwarves can flee to the surface.The nightmare would end with him, seeing Flemeth enslaving Morrigan, and turning his son Kieran into a monstrous being that would bring the end to this world, and he's forced to kill his own son and lover.