Certain, specially created, items can be used focus the the power of a caster. Most of these items appear at first to resemble existing magic items and, in fact, many can have the functions of their corresponding item integrated into it or some other boon. Unless stated otherwise, upgrading a casting focus increases it's price by twice the cost to upgrade it. Each item grants a boon to the caster, improving their magic.

Holding a casting focus does not prevent that hand from performing somatic spell components. Depending on the item, either normal somatic components are used or some manipulation of the item is used in place. Additionally if casting a touch spell, the charge becomes attached to both the caster's hand and the casting focus and can be discharged by touching either one.

All casting foci can be enchanted like a magic weapon. Enhancement bonuses add to any attack rolls or save DCs associated with the spell. Melee weapon properties only apply to damaging spells with a range of touch, while ranged weapon properties only apply to damaging spells with a range longer than touch and that are a "ray" effect or that have a target or targets. Weapon properties with additional restrictions cannot be applied to casting foci. Certain exceptions do apply however. If a casting focus is enchanted with ghost touch all spells cast with it are unaffected by the incorporeal quality as per ghost touch. A casting focus can be enchanted with the deadly property which changes any non-lethal damage dealt by spells cast with the focus to lethal damage instead but also makes every spell cast with the focus count as a "damaging" spell. If a casting focus is enchanted with the keen quality or is the subject of the keen edge spell, it doubles the threat range of all attack rolls associated with spells cast using the focus. An enchanted casting foci has the higher caster level of its base caster level and the caster level of its enchantments.

Some casting foci can be wielded and enchanted as some type of weapon. Enchantments on these items apply separately to its use as a casting foci and as a weapon similar to if it were a double weapon, listing enchantments on the casting focus functionality first. When applying an enchantment to either the casting focus or weapon functionality, the material component cost of making the item is reduced by the square of the overlapping equivalent enhancement bonus times 1,000 gp and the required time at the same rate. (i.e. Enchanting a +2 bane / +3 ghost touch shocking burst spell potency staff to +4 bane shocking burst / +3 ghost touch shocking burst would cost (49,000 - 25,000) - (9,000 - 4,000) = 24,000 - 5,000 = 19,000 gp and take 38 days instead of 49,000 - 9,000 = 40,000 gp taking 80 days.) (WIP, Subject to change.)

Casting foci are seperated into a number of types. Any caster can use any type of focus and the type has no effect on its functionality, though the type does indicate what type of caster it was designed for and therefore who might get the most use from it.