Pure casters are those who draw upon only one realm of power and they have been divided into their respective realms for ease of reference.  It is important to note that pure casters are the only group of profession who may choose up to 4 more spell lists from their respective open or closed lists and develop them as if they were base lists, giving them a total of 10 base spell lists.

Essence:
Illusionist: Manipulates people around him with illusions (CL page 19)
Magician: Your all-purpose elementalist caster (FRP page 95)

Channeling:
Animist: Specializes in living plants and animals (CL page 20)
Cleric: Earthly representatives of their deity (FRP page 96)

Mentalism:
Lay Healer: Aids with the recovery powers of others (CL page 21)
Mentalist: Casters who manipulate the world purely with their minds (FRP page 97)