Seeker
Seekers are magi that seek out the Old Ones and the ancient secrets of magic. They are an open Societas, although nominally headed by members of House Bonisagus. See HoHTL 15.
See also Ancient Magic for examples of magic that Seekers may uncover (Seekers are briefly mentioned on page 7.)
Also a Minor Personality Flaw, see HoHTL 25.
Publishing history
As with the Houses of Hermes, Seekers were introduced in the Second Edition sourcebook Order of Hermes.