Rust Dust (Magic Dust)

Rust dust looks like a fine metallic powder similar to dust of appearance or other magical dust. It is usually contained in small silk pouches for dispersal by hand or spread by blowing the dust through a hollow bone tube. If it is shaken out by hand, one pouch will cover a 10 foot radius area; dust blown from a tube will create a cone 20 foot long, 1 foot wide at the start and 15 foot wide at the end. Usually, idle containers of either sort may be found at one time.
Any nonprecious, metallic materials within the area of effect of rust dust rusts (or otherwise deteriorate) and fall into useless scrap one round after contact. Precious metals (gold, platinum, and silver, for instance) are not affected. Objects of iron, copper, bronze, tin, and similar metals or alloys (including mithril and adamantite) are affected automatically if the metal of the item is nonmagical.
Magic items (swords, armor, shields, rings of protection, and similar items) must save as if struck by a rust monster, gaining a 10% chance to withstand the dust for every “plus” of enchantment; thus, a sword +4 has a 40% chance of not corroding. Magical items or objects without a “plus” rating (such as an iron flask, iron golem, or ring of spell storing), have a 10% chance to save against the dust. All such saving throws must be rerolled every time a new dose of rust dust is encountered. 
Category:Encyclopedia Magica Magic Items
Category:Magic Items
Category:Magic Dust