The Maeghar were never a bloodline. Most share no common ancestry with each other, and many do not even hail from the same Clan. They are merely a collection of accidents, a mixture of blood and fae-blooded wyrd that should never have been possible, effectively a specific kind of Caitiff. There is no kinship here, no sense of shared destiny.
Originally, the Maeghar were called Kiasyd, a collection of isolated accidents that appeared when a Cainite tried to inflict his curse on a being with fae-blood. When the Middle Ages drew to a close, the Renaissance picked up, and the Kiasyd began disappearing as one of their lot sought to rule alone; they did not fight back. They did not speak out; they did not resist. They simply packed their belongings and left both disputed territory and their old name behind.
In the modern nights, Maeghar are solitary wanderers who travel from place to place, having no real ties to mortals or Kindred. They avoid the Sabbat and Marconius' Kiasyd brood. Typically, they will have a single prized, and disturbing, collection of some small item like children's teeth, finger bones, or broken dreams.
All Maeghar have some physical feature indicating their fae nature, which can range from the subtle (snow white skin and ebony hair) to the blatant (six arms).
The Maeghar's weaknesses are three-fold – like the Kiasyd, they are vulnerable to cold iron; all rolls to identify them as otherworldly are reduced by one; and they are repulsed by drinking from mortals directly, requiring the blood to be drained into a container, although they can feed from vampires directly.
In earlier times, when the Maeghar held the Kiasyd name, even those of their childer who had not been faerie-blooded in life became Kiasyd, and they could drink from mortals directly without resorting to a container. They had access to Mytherceria and two Disciplines from their original sire's list; Necromancy was not yet common amongst them.
Maeghar are solitary creatures, often more interested in the Shadowlands than contact with the world of the living. When they meet with another of their kind, the exchange will be brief, but polite, before both will leave each other behind.