The source of the undead army we've been facing on Aeon has been identified as Lord Shak'eshis Ravenheart. One of the stranded Talrok, it seems he is the descendant of one of the Magus families before the rift. The Savants have theorized that using his ancestors tomes and scrolls he was able to unlock the forbidden secrets of Necromancy and has been slowly exerting his influence over the entire island before we arrived to await our Lord. The only other possibility seems unlikely but is far more terrifying; a demon has survived the previous ages and instructed him in the dark arts. Thankfully we have no proof of the latter case being true, so we simply need to eliminate the heretic and the undead should become an easily manageable problem. Good luck Exemplar and may your heart stay strong.