For the April Fool's Joke class, see Archivist.
The Archivist, Dark Lorekeeper is a unique Wraith that can be found in The Unknown Depths in Act II of Diablo III.
In combat, he has Vortex, Fast and Orbiter traits.
A bounty may be offered to kill The Archivist, in which case the secondary objective is to kill 100 enemies. He also must be killed in order to obtain the Haunted achievement.