The party found powerful necromantic rituals inplace that were siphoning energy from the Death Stone. They believe this to be the work of Teo, although they never found the man himself. Surrounded by Nieznanes, the party had to use an Amulet of the Planes to escape, meaning that the Necromancer is still at large.
Wanted by the Servants of the Weave, Teo was once a contemporary of the order. After troubling tales spread through the mage's guild of the Death Stone, Teo saw an opportunity. He vanished from the order, ready to carve his own path. Gone were the days where the authorities within the Servants of the Weave would restrict the practices of his necromancy. He found it was time to turn away from such bureaucracy, and seek an ancient power to benefit his goals.