This curious creature is drawn to steel the way rats are drawn to corpses. Some have observed that it seems to resemble the monstrous arthropods of Chur Gor, a strange and distant desert land.
CR3 Rust Monster - Slain by Siegfried HP27 Initiative+3 Speed40(8) AC18(T13,FF15) Bite+3/+3(rust+d3+d4acid) SQ Darkvision, scent, corrosive secretions Saves+2+4+5 Abilities10,17,13,2,13,8
The rust monster's corrosive secretions destroy mundane metal armour worn by those it bites, and have a 50% chance to destroy mundane metal weapons that damage it.