Here's my first stab at prices. Psionic stuff is a little more expensive seeing as they use only 2 types of runes in their manifestation.
Earth: 5 silver pieces
Water: 5 silver pieces
Fire: 5 silver pieces
Air: 1 gold piece
Mind: 3 gold pieces
Chaos: 3 gold pieces
Death: 3 gold pieces
Cosmic: 3 gold pieces
Nature: 3 gold pieces
Law: 3 gold pieces
Astral: 3 gold pieces
Body: 5 gold pieces
Blood: 15 gold pieces
Soul: 50 gold pieces
Here is how runes play out for me
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School Runes
Nature: Transmutation
Mind: Enchantment
Chaos: Evocation
Death: Necromancy
Astral Conjuration
Cosmic: Divination
Law: Abjuration
Body: Psionic Manifestations
Ability Runes
Water: Intelligence
Earth: Wisdom
Fire: Charisma
Air: Psionic's Prime Casting Ability
Special Runes
Soul: Replaces material components
Blood: Metamagic/Metapsionic Component
- (1 per level adjustment or 1 per power point)
All spells are at their minimums, like a bought Scroll, regardless of the Ability Score of the caster or his/her own CL or ML.
School runes (Nature, Body, etc.) are used to increase the power or spell's caster/manifestor level to a maximum of the caster or manifestor's CL or ML.
Ability runes (Air, Fire, Water, Earth) are used to increase the ability score (starting at minimum required score) to the maximum of the manifestor/caster's current casting ability score.
Example: lvl 8 Wizard with 18int casts Fireball.
- Without runes: The fireball deals 5d6 fire damage, with a reflex save of 14 for half. The minimum caster level of 5, and the lowest Ability Score of 13int.
Cost = 0 runes
- With runes: The fireball deals 8d6 fire damage, with a reflex save of 17 for half.
Cost = 5 Water runes to increase the ability score from 13 -> 18; and 3 Chaos runes to increase the CL from 5 -> 8.