For some reason, I wanted to design this monster with Advanced Dungeons & Dragons statistics. I have no idea why. And I am sure someone else has done this before me. But I wanted to put it out there.

TETRAHEDRON

FREQUENCY: Very Rare
NO. APPEARING: 1-4
ARMOR CLASS: 4
MOVE: 4″
HIT DICE: ¼
% IN LAIR: Nil
TREASURE TYPE: Nil
NO. OF ATTACKS: 1
DAMAGE/ATTACK: 1-4
SPECIAL ATTACKS: Maim
SPECIAL DEFENSES: Surprise on a 1-5
MAGIC RESISTANC: Standard
INTELLIGENCE: Low
ALIGNMENT: Chaotic Neutral
SIZE: S (rare specimens grow as large as 4″)
PSIONIC ABILITY: Nil
    Attack/Defense Modes: Nil

The Tetrahedron is a small creature of unusual physiology. Sages are divided as to whether they evolved naturally, were created by mad wizards, or have travelled here from one of the inner or outer planes. What is certain is that those unfortunate individuals who have encountered them never forget the experience.

The Tetrahedron typically lurks on the floor of a cave, although some have been known to find themselves into the bedrooms of the upper world. There it waits for its prey, for it derives sustenance from both blood and the psychic trauma of its victims. It has the ability to quickly transfer itself under the foot of any creature that is moving and, with its razor-sharp point, injure the creature’s appendage. This movement could be akin to teleportation, but the method has not yet been distinguished.

A creature struck by a tetrahedron reduces its movement speed by 1″ each time so damaged, with a saving throw vs paralysation to negate this additional effect. Upon reducing a creature’s speed to 0″, the creature becomes paralysed and the Tetrahedron gorges until it has taken 16 hit points from the creature, after which it disappears to an unknown destination.

Its small size and innocuous appearance allow Tetrahedrons to surprise their opponents 5 times in 6.

Description: The tetrahedron is a four-sided polyhedron apparently made of stone, typically of black, white. or red hue, with arcane markings of gold or silver upon each side. Most are about one inch or less across. It is commonly mistaken for a component of games of gambling and chance.