This amethyst is carved in the shape of a humanoid skull.

Clerics craft truedeath crystals to aid themselves and others in sending undead to their final rest.
A weapon with this crystal attached deals an extra 1d6 points of damage to undead, the weapon also functions as a ghost touch weapon and the weapon can deliver sneak attacks and critical hits against undead as if they were living creatures.

Prerequisites: Craft Magic Arms and Armor, consecrate.
Cost to Create: 5,000 gp, 400 XP, 10 days.