The pommel of this weapon bears a single diamond that flashes with an inner radiance.
An energy surge weapon functions as a weapon of the prerequisite type (corrosive, flaming, frost, or shock).

In addition, on a successful melee attack with an energy surge weapon, you can command it to expel a blast of energy, of the same type as the prerequisite property, which deals an extra 3d6 points of damage to the target of the attack. The synergy prerequisite property need not be active to activate the energy surge property.
This ability is usable a number of times per day equal to 1 + your Con bonus (if any). Once you activate this property, it can’t be activated by any other creature until the following day.
A weapon can have this property more than once, but only once per synergy prerequisite, and each activation only triggers one type of surge. For example, you could have a +1 corrosive surge flaming surge longsword, and each activation would deal either 3d6 points of acid damage or 3d6 points of fire damage.
Each diamond set into the pommel or haft of an energy surge weapon radiates a different color that corresponds to the energy damage dealt by the weapon: green (acid), blue (cold), yellow (electricity), or red (fire).

Prerequisites: Craft Magic Arms and Armor, spell for the prerequisite property.
Cost to Create: 1,000 gp (plus 300 gp for base item), 80 XP, 2 days.