Alternating fire opals and jacinths comprise this glittering chain of gemstones.

The augment crystal known as a phoenix ash threat leaves smoldering embers on your enemies after every strike. Each round, at the start of your turn, the embers deal fire damage to each target struck by the weapon in the previous round.
If you hit a creature with a weapon bearing this crystal, that target takes 3 point of fire damage on the following round. Multiple hits by the weapon against the same target aren’t cumulative.

Lore: This crystal was first employed by mystic swordsmen of the Golden Desert (Knowledge [arcana or history] DC 15).
The first signs that it was in use in more civilized lands were the charred bodies of Graz’zt cultists left piled outside their dark abbey’s door after Sir Alax of Bergholdt cleansed the den with his fiery sword (Knowledge [arcana or history] DC 20).

Prerequisites: Craft Magic Arms and Armor, burning hands.
Cost to Create: 1,000 gp, 80 XP, 2 days.