FREQUENCY: Rare
FREQUENCY: Rare ([Dungeon Level I])
FREQUENCY: Rare ([Cold Wilderness Mountains])
FREQUENCY: Very rare ([Cold Wilderness Hills])
FREQUENCY: Rare ([Temperate Wilderness Mountains])
FREQUENCY: Very rare ([Temperate Wilderness Hills])

FREQUENCY: Rare ([Tropical Wilderness Mountains])
FREQUENCY: Very rare ([Tropical Wilderness Hills])

NO. APPEARING: 2-20
ARMOR CLASS: 2 <(NAC=?)>
MOVE: 9"
HIT DICE: 1-6 hp
% IN LAIR: 5%
TREASURE TYPE: [C]
NO. OF ATTACKS: 2
DAMAGE/ATTACK: 2-5/2-5
SPECIAL ATTACKS: Surprise on a 1-4
SPECIAL DEFENSES: Nil
INTELLIGENCE: Low
ALIGNMENT: Neutral (evil)
SIZE: M
LEVEL/X.P. VALUE: I | 7 + 1

The vilstrak are known as marl muggers || tunnel thugs by humans.
A vilstrak's stony substance provides it with both excellent protection and the uncanny ability to physically merge with earth or stone.
This makes them 75% undetectable even at as little as a 20-foot distance. <1>
A vilstrak's attack consists of 2 club-like blows of its fists. <2>

Lair: A vilstrak's lair is typically in a hollow space in the earth or stone, which
is reachable only by beings able to pass through solid stone or packed soil.
However, not being too bright, vilstraks sometimes (5%) select a
den where the hollow can be detected and broken into. <3>
There, plunderers will find treasures carried into it by the avaricious creatures.

<1. apply DMG invis. modifiers?>
<2. apply PH weapon vs. AC? (club)>
<3. SEARCH?, dwarven detection abilities?> <to get in there, the Siege rules in the DMG will be needed>

Personality: avaricious