Ankou

Ankou is the starting and ending NPC for the Tower of Ascension quest. From the little dialogue he says, there is definitely something strange and mysterious going on, and from his appearance, he is most likely an undead, since “he knows him [Death] very, very well”. (In fact, Ankou is the personnification of Death in Breton mythology or it could be referencing Celtic folklore, since Ankou is death's henchmen in Celtic folklore)

Location
Ankou is located in the Tower of Ascension in the Ice Canyon. The closest settlement is Lusuco.