Furculan Harp: This small, handheld harp is made from the wishbone of a celestial griffin, and is translucent and slightly opalescent in coloration. It is alchemically treated with elemental fire and laminated with entsap, and often enameled with scenes from myth and legend. It is strung with mithril wire.
The quality of an furculan harp is such that when used, it grants a +3 circumstance bonus to performance checks, a +1 to the difficulty check of all enchantment spells cast by it's player, and increases the bonuses granted by inspire courage by +1.
Somebody can "tune" a furculan harp to cast a certain first level spell once per day. This is done by making a DC 15 perform (lyre) check and casting the spell into the harp. It takes 8 hours to tune a Furculan Harp. Thereafter, once per day, the harp can be played and the spell cast as if the player had memorized the spell or expended a spell slot.
The spell remains in the harp until it is retuned.
Moderate enchantment; CL 5th; Craft wondrous item, Craft (instrument) 8+, ability to cast enchantment spells; Price 5,000 gp
+3 to perform = 3*3*100 = 900
+1 DC to broad catagory of spells: 1*1*2000=2000
Extra spell slot (with limited flexibility) = 1*1*2000=2000
+1 to broad class feature with limited uses (roughly +1 bonus?) = 2,000
multiple similar = 2000 plus 75% of 2000 plus 50% of 2000 plus 50% of 900 = 4,950
When I was mulling over the fluff for this article, I thought of using some exotic wishbone. My wife suggested the catchy name for the item.