You know how to attach semipermanent spells to a creature and set them to activate under certain conditions.
Prerequisite: Caster level 11th.
Benefit: You can make contingent any spell that you know. Crafting a contingent spell takes one day for each 1,000 gp in its base price (spell level x caster level x 100 gp). To craft a contingent spell, you must spend 1/25 of this base price in XP and use up raw materials costing one-half the base price. Some spells incur extra costs in material components or XP (as noted in their descriptions), which must be paid when the contingent spell is created.