Established source
Its Quasar component ties it to the material; its Penumbral component to relations and dynamic flow.
Rosmer CreativeMaterial substance meets the relational flow mortals call fate.
Witchcraft is an emergent interaction between Quasar substance and the Penumbrae—the relationships, connections and ceaseless flow between things.
Its Quasar component ties it to the material; its Penumbral component to relations and dynamic flow.
Its discovery opens the Age of Darkness.
The original plane, practice, limits, social role and consequences of Witchcraft have not yet been fixed in the canon.