Rock mole

r rock mole
Difficulty	4
Attacks	Bite 1d6

r rock mole
Difficulty	4
Attacks	Bite 1d6
Base level	3
Base experience	29
Speed	3
Base AC	0
Base MR	20
Alignment	0 (neutral)
Frequency (by normal means)	Rare
Genocidable	Yes
Weight	30
Nutritional value	30
Size	Small
Resistances	None
Resistances conveyed	None
A rock mole: can tunnel through walls. has no hands. is an animal. can eat metal. is normally generated hostile. likes gold. likes gems. can pick up weapons and food. can be seen through infravision.
Reference	monst.c#line826

The rock mole is a mole that eats through rock (surprise!). They are able to eat anything metal, including some amulets and rings, as well as zorkmids.

Strategy

When found in a treasure zoo, it is wise to kill them quickly before they eat all the gold.

Encyclopedia entry

A rock mole is a member of the rodent family.  They get their
name from their ability to tunnel through rock in the same
fashion that a mole tunnels through earth.  They are known to
eat anything they come across in their diggings, although it
is still unknown how they convert some of these things into
something of nutritional value.