In the Vault of the Archon she and all the paragons have mirrors in the deepest level; the Archon’s dead center, three to her right and two to her left. But on the floor there’s a mirror you can’t interact with called the “Eye of Agthia” that seems to hint at a sixth paragon whose fate is unknown and doesn’t have a temple or virtue connected to them. Who is, or was Agthia and will they play a role down the line in Shadowlands?
Edit: Ok she apparently sacrificed herself to save Bastion a while back.