From SuspireWiki

Quiet and unseen, but omnipresent, the vampires derided as mere servants bear a far more important heritage and duty than even they know. Their unique Obtenebration Discipline is only a hint of their higher calling.

Nickname: Asps (ancient role), servants (modern role)

Parent Clan: Mekhet

You can find more information on this bloodline in the Bloodlines: the Hidden book.