Spell Keys and Power Keys (GAP)

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Spell keys usable on the Astral Plane take the form of mental exercises or states of mind. The caster must clear his mind of other thoughts and focus in a certain way in order for the spell to work. Like other spell keys, these methods of focusing thought are not obvious and require that the caster learn them from some source.
Due to the near-total lack of living deities on the plane, power keys on the Astral are unavailable, although those provided by nonastral powers function normally here if the power so desires.