This black iron weapon is decorated with dozens of silver skulls. Runic phrases describing vile acts run along its blade or haft and glow when it is wielded.

A profane burst weapon functions as a profane weapon.
In addition, the weapon explodes with negative energy on a successful critical hit, dealing extra negative energy damage as set out in the table below. (This effect activates even if the target is not normally subject to extra damage from critical hits.)
A profane burst weapon deals even more damage to good outsiders on a successful critical hit. This burst does not harm you or any creature other than the target if you are undead; otherwise, you take 1d4 points of Constitution damage (or Charisma damage if you have no Constitution score). This is a continuous effect and requires no activation. Even if the weapon has not been activated to deal extra damage because of the profane property, the weapon still deals its extra negative energy damage on a successful critical hit.

Critical Multiplier	Extra Damage	Good Outsider Extra Damage
×2	1d10	2d10
×3	2d10	4d10
×4	3d10	6d10

Projectile weapons bestow this property upon their ammunition.

Prerequisites: Craft Magic Arms and Armor, inflict critical wounds.
Cost to Create: 1,000 gp (plus 300 gp for base item), 80 XP, 2 days.