Undead Rustmonster

The Undead Rustmonster looks mostly like its living relatives, but its flesh are often rotten, and sometimes it almost looks like a skeleton.
These creatures have a never ending appetite for any items of any kind, exceot those made of stone or silver. They are feared by everybody ( save vs. fear at -2 when spotted ). An average Undead Rustmonster is about 5'long and 3'high. Undead Rustmonsters have a very strong tail, which they use for attack ( unlike their living relatives ). It is very athletic, and has a lot of strong bones, some of them resembling scales, to protect it from attacks.
The Undead Rustmonster has two small deep-red eyes, and just below them, are placed two small antennaes. The Undead Rustmonster has four legs, but these are only for running and swimming, not for use in combat.

COMBAT
With its long and powerful tail, the Undead Rustmonster can even hit a target in front of it. Whenever it scores a succesful hit on a person wearing shield or armor of any kind, the armor/shield must make a succesful saving throw vs. crushing blow, or suffer 5 points of armor damage and 2d12 in damage to the person wearing/carrying it. The Undead Rustmonster also has two black tentacles and when one of these strikes a person carrying at least one item, one random item will disappear unless it makes a succesful saving throw vs disintegrate ( Item Saving Throw Tabel 29, DMG page 39 ). These tentacles always attack against armor class 10, not counting armor, only dex-bonuses and magical bonuses are calculated when determing its victims armor class. The tentacles also have another attack, their poison only has to touch the persons skin in order to cause 2d20 or 2d8 in damage.

HABITAT/SOCIETY
The homes of Undead Rustmonsters are often located in stone caverns near water, and most often their entrances are located below the waterline, so bounty-hunters and adventureres have a hard time to find their home. Another place in which you are able to find Undead Rustmonsters, is in dungeons where they have been held captured and imprisoned. An Undead Rustmonster is only active during a New Moon, this makes them a very easy target for enemies in the time between two New Moons, because they are very hard sleppers.

ECOLOGY
An Undead Rustmonster regenerates as a troll, except it only regenerates 2 hit points/round. It continues to heal, even after it has been smashed to dust. The Regeneration can only be stopped in three ways, and before each of them can work, the Undead Rustmonster needs to be dead ( once more ). The first way, is to splash holy water on the bones and then make a holy ritual while you bury them. The second is to lay the dead Undead Rustmonster on a floor/plate made out of pure silver. This methos has a little disadvantage, because when somebody moves the Undead Rustmonster back to a normal surface, the regeneration starts anew. The last way is to remove its soul with spells like Trap Soul. Normally this creature is made in a natural way, but if an alliance between a powerfull wizard and an evil priest is made on a night with full moon, they can together create an Undead Rustmonster with the body of a dead Rustmonster and the following spells : Serten's Spell Immunity Disintegrate, Enchant an Item, Globe of Invulnerability, Animate Dead, Water Breathing, Strength, Resurrection, Poison, Free Action.