Entropy Blade

An entropy blade is a +1 bladed weapon (typically a one-handed sword, as few want to endure the flaying required to make a two-handed weapon) designed to combat a specific single threat against which it functions as a +3 magic weapon. Suitable threats are unique and named creatures that are enemies of entropy, such as a specific hierarch modron, a mighty devil, or a fallen astral deva. When this specific threat is destroyed the entropy blade turns to dust.

In addition, each entropy blade has unique properties according to which of the four Doomguard Citadels it was forged at:

• Ash blade: Forged in the Crumbling Citadel, this blade grants its wielder resistance to fire damage and the chill touch cantrip.
• Dust blade: Forged in Citadel Alluvius, this blade grants its wielder resistance to earth and stone-based damage and the ability to cast move earth once per day, though only to destroy earth.
• Salt blade: Forged in Citadel Sealt, this blade grants its wielder resistance to water-based damage as well as immunity to dehydration and the ability to cast create or destroy water once per day, though only to destroy water.
• Vacuum blade: Forged in Citadel Exhalus, this blade grants its wielder immunity to gas attacks and the ability to cast ray of enfeeblement once per day by touch.