The needlelike iron deposits in this spherical quartz crystal pulse with arcane energy.

A crystal of arcane steel is designed for those who can blend magical and martial arts into a single strike. It functions only when attached to a melee weapon.
This crystal grants a +1 insight bonus on your weapon damage roll when delivering a spell or spell-like ability through a melee attack with the weapon.

Prerequisites: Craft Magic Arms and Armor, magic weapon.
Cost to Create: 250 gp, 20 XP, 1 day.