This is a representation of a character's attunement to a particular magical or psionic form such as Fire Elementalism, Conjuring, Telekinesis, Telepathy, or Manipulation. Before a character can even begin to use any magical or psionic abilities, she must have at least one rank in an appropriate Discipline. Higher ranks in a Discipline reduce the amount of stamina used while spell casting, increase spell power, and allow access to more powerful abilities. More detail is included in the section on Magic and Psychic abilities.
Optional Rule: Some GMs may choose to play with a simplified rule where characters possess a single discipline rank which governs all of their spell casting abilities for each of their magical disciplines instead of individual discipline skill ranks for each discipline. The purchase of new disciplines is more expensive under this rule.