Ritual Magic
Default: Religious Ritual (same)-6.
This skill gives an understanding of the intellectual and mystical processes involved in the rituals of a particular tradition of spirit invocation. Make a skill roll to determine the purpose of a ritual conducted in your presence, the type of entity being summoned, etc. You must specialize by tradition; e.g., Voodoo or Witchcraft. Specialties default to one another at -5. The processes involved are comparable, but the specific rituals and spirits differ significantly.
In worlds with working ritual magic, Ritual Magic skill is the primary skill of sorcerers. All rituals of power default to it! See the appropriate worldbook for details.
This is the skill of invoking spirits to produce magical effects for nonreligious reasons. The equivalent skill for the more direct, flashy magic of fantasy is Thaumatology; knowledge of religious rites associated with a tradition is Religious Ritual.