Argar is an Argonian that used to be working as an assistant under Urzashi. He can be found dead inside a delve on one of the three Alliances' regions, Stonefalls, Glenumbra or Auridon. He was supposed to pick up a package for Urzashi, but he was killed when he entered the old ruin.
Urzashi says that she wants the Vestige to look for her missing assistant in order to reveal any information she knows about Margus Derius, sending them to an old ruin he could be found in. When the Vestige explores Sheogorath's Tongue, they discover Argar lying dead next to his broken sword.