Cyclical Magery

Cost: Variable
Cyclical Magery is a limitation on Magery where spells can only be cast at certain times. The cost should be roughly proportional to the fraction of the time the advantage is unavailable.
Some examples:
* Astrological (-80%): Magery is only available one month out of the year.
* Ill-Omened Dates (-5% or -10%): Magery is unavailable on a few specific dates.
* Lunar Magery (varies)
:* Magery is unavailable around the time of the new moon or the full moon (-5%)
:* Magery is only available while the moon is waxing or waning (-40%)
:* Magery is only available around the time of the new moon or the full moon (-80%)
* Personal (varies): Magery is tied to something other then unrelated to anything identifiable in the outside world. This form can require a lot of bookkeeping.
GURPS Thaumatology 23
Category:Limitations