CRAFT CRYSTAL WEAPON [Elf, Item Creation]

You can create magic weapons from elven kuni crystal, which is deadly to the oni.
Prerequisite: Spellcaster level 7th+, Craft Magic Weapons and Armor, Craft (weapons) skill 5 ranks.
Benefit:You can forge a weapon out of elven kuni crystal, if you meet the other prerequisites for doing so (holy smite or
jade strike and daylight).  You must first create the weapon, using the rules for the Craft skill in the Player ’s Handbook (a kuni crystal weapon adds 400 gp to the listed weapon price and has a DC of 20).  Then you must enhance the weapon, which takes one day for each 1,000 gp in the price of its magical features.  To enhance a weapon, you must spend 1/25 of its features’ total price in XP and use up raw materials costing half this total price.  See Chapter 8: Magic Items of Oriental Adventures for details of Kuni crystal weapons’ cost and abilities.

Normal: Weapons and other items made from normal crystal are not inherently dangerous to the oni, nor do they possess any other extraordinary abilities, unless specifically augmented.