Ghosts

Ever since the Neverborn's death broke the cycle of reincarnation, those who die with their business unfinished turn up as Ghosts in the Underworld. Ghosts have access to what they were buried/burned with (their grave goods) and are able to channel essence and learn ghost charms, called Arcanoi. Ghosts who settle their business can pass into Lethe as they should have and reincarnate. Those who give into the Whispers of Oblivion (usually by wandering the Labyrinth) turn into crazed Spectres intent on spreading the word of Oblivion by force. Their third option is to toss themselves into the Mouth of Oblivion and utterly cease to exist.