Major spoilers, I guess. mmm
Spoiler:
Valkorion's death at the end is apparently permanent. Apparently it's a joint effort from Arcann, Vaylin, Senya, Dramath, and the player. Not sure if it's an actual duel, a test of wills, a ritual, or some combination thereof.The player has an opportunity to then ascend to the Throne, declare the Eternal Alliance, and prepare for the Republic and the Sith empire, which are apparently mobilizing for war in light of Valkorion's death and the Eternal empire's struggles.
Originally posted by Zenwolf
Some Sith Lord mentioned in the Revan novel, who yeah is Vitiate's father apparently and should be dead, but apparently isn't.
That or it could be
Spoiler:.
his spirit
There's also
Spoiler:
a Manchurian candidate aspect to Vaylin's blocked power. Valkorion uses a phrase, "kneel before the dragon of Zakuul," to contain/release it.