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Benefit

You can cast any divine spell you have prepared as a rune. The caster must have prepared the spell to be scribed and must provide any material components or focuses the spell requires. If casting the spell would reduce the caster's XP total, he pays the cost upon beginning the rune in addition to the XP cost for making the rune itself. Likewise, material components are consumed when he begins writing, but focuses are not. See the Rune Magic section in Chapter 2: Magic for the details of runes and rune magic. A single object of Medium-size or smaller can hold only one rune. Larger objects can hold one rune per 25 square feet (an area 5 feet , "square) of surface area. Runes cannot be placed on creatures. The rune has a market price of the spell level X caster level X 100 gp (a 0-level spell counts as 1/2 level). You must spend 1/25 of its market price in XP and use up raw materials costing half this market price. A rune's market value equals its base price.