Tremere/ghouls
From Masq
The role of ghouls in clan Tremere is only touched on briefly in the Clanbook, on page 40, along with mention of Revenants and (on p 41) Homunculi and Gargoyles.
Ghouls are frequently chosen as Embrace candidates, or for special skills that would enable them to be particularly useful assistants. Ghouls are also created when a Chantry is short of low-level Apprentices to do the more menial tasks of (un)life.
Very occasionally, a ghoul is given the chance to learn some basic Thaumaturgy. This is rare, and usually occurs when a ghoul is especially favoured and there is a need for an extra skilled hand for some purpose.