The ability to draw a simple charter-symbol in charming is available even to the non-sorcerous. Those of very faint talent may perform the simplest of charter-symbols as long as said symbols are “married” to a physical item. A charmer must be able to hold a charter-symbol in free air for at least a few moments in order to be apprenticed; it is legal to indenture charters but not charmers or above.
The last Skellewreyn, the famous and rebellious Agnes Nice, was hung in 1712 in Hardwitch. Afterward, Skellewreyn – too much talent to be a mancer and not enough to be a properly-Disciplined witch, driven mad and physically twisted by their sorcery – did not appear, or if they did, they kept to certain shadows. Some of the Morloks are rumored to be of their ilk.
Witches are held to be Common, since their Discipline fills their entire brain with no room left for the “splitting” of focus a Sorcerer or above must perform. A Sorcerer may perform a Greater Work without losing track of one’s whereabouts; a Master Sorcerer or Adeptus may move physically while performing a Greater Work, and of course a Prime may successfully assay more than one Greater Work at once.