Entropic Blades info

The Doomlords also give their champions blades of tremendous power - specially forged on the quasielemental planes - each specifically designed to combat a single threat. Once the threat's been negated, the blade turns to dust. 'Course, disposing with a major threat may take considerable time; an entropy champion might spend his whole life trying to complete a mission, passing his blade on to a worthy successor if necessary.

An entropy blade is generally a short sword imbued with a +2 bonus to attack and damage rolls. However, when used against the threat it was designed to fight, the bonus increases to +4. Entropy blades aren't subject to the usual adjustments applied to magical weapons crossing the planes - after all, entropy is everywhere. When used against their intended threat, the blades have other powers, too, depending on the plane where they were forged:

• An ash blade protects the bearer like a ring of fire resistance and can cause a chilling touch three times per day.
• A dust blade protects the bearer against earth- or stone-based attacks and also disintegrates stone or earth by touch once per day.
• A salt blade provides the bearer with water resistance (per the ring of fire resistance, though against water-based spells or attacks). The bearer also can lower water or destroy water (both as a cleric of 12th level) three times per day.
• A vacuum blade makes the bearer immune to gas attacks, such as a green dragon's breath or a stinking cloud spell. Moreover, it can enfeeble (per a ray of enfeeblement wizard spell) three times per day by touch.