Even among vampires, the insular Clan Tremere bears a
  reputation for treachery. This reputation is well earned; the
  Tremere were formerly a cabal of human wizards who,
  hungering for immortal life, wrested the secrets of vampirism
  from unwilling Kindred. Such vile deeds earned the clan a
  sinister reputation; even today, certain vampire clans would
  love nothing better than to destroy the entire Tremere line.
        Nonetheless, Clan Tremere holds a place in the
  Camarilla, for its members were instrumental in suppressing
  the Inquisition and supporting the Masquerade. Then, too,
  the Tremere have proved themselves dangerous enemies -
  and powerful allies. Tremere still practice a version of the
  arcane arts they studied in life, and so these "warlocks" use
  their sorcerous powers in service to the Camarillaalmost as
  much as they use the Camarilla in service to themselves.