Devastation Drive-In 3-D — 'The Slime People' (1962)

Slime People

No. Enc.:  3d6 (10d20)
Alignment:  Chaotic
Movement:  75' (25')
  —Burrow:  30' (10')
Armor Class:  4
Hit Dice:  15
Attacks:  2 or 1 (2 claws, or by unique spear)
Damage:  1d8 / 1d8, or 4d6
Save:  L13
Morale:  10
Hoard Class:  XXII
XP:  6,900

As The Ancients relentlessly consumed the planet's fossil fuels, they devised fantastic technologies to unearth new reserves of gas and oil...

...which lead them to explore—and despoil—the subterranean bowels of the earth...

...WHERE AWAITED A MONSTROUS, PREHISTORIC RACE INTENT ON CONSUMING THE ANCIENTS IN TURN!!!

Slime people are scaly, slimy, semi-shaggy, subterranean bipeds.  Their heads, necks, and backsides are lined with armored plates, and long, wet fur dangles from their arms and torsos.  

Slime people possess self-sealing, nigh-invulnerable skin, making them completely resistant to conventional firearms, explosives, pollutants, and all but one kind of melee weapon: piercing spears.  A slime person's skin doesn't seal from spear-based injuries, and suffers damage as normal...and a successful strike with its race's own unique weaponry kills it instantly.

Despite being a seemingly Stone Age culture, slime people were capable of defeating The Ancients advanced armies with nothing more than their aforementioned spears.  They accomplished this task by enveloping entire cities in walls of impenetrable (to humans and their technology, that is) fog, after which they'd capture the populace and drag it beneath the earth...never to be seen again.

Slime people are dependent on their special fog to survive above ground; without it, they suffocate within 1d6 rounds.

Mutations:  Enhanced Vision (Night), Frailty ("Fog Dependency") [D], Frailty ("Spear Sensitivity") [D], Natural Armor (Extreme), Unique Mutation ("Self-Sealing Skin")

Artifact:  Fogwall Generator

To safely venture on the earth's surface, slime people employ 15' diameter, techno-organic fogwall generators that discharge thick, vision obscuring vapors.  The contraptions and their techno-organic membranes somewhat resemble oversized toadstools.  One generator can release enough fog to cover dozens of square miles (both horizontally and vertically) that envelops an entire city.  Any human stuck in the "fogwall" suffers a -4 penalty to sight-based Ability Checks and ranged To Hit rolls.  The outer perimeter "edges" of the clouds are also hardened and completely impenetrable (even to atomic bombs!), so no one can enter or exit the barrier.  Temperatures within the fogwall are 20-30 degrees less than outside.

Of course, slime people are unimpeded by any ill effects of the fogwalls, and the can traverse freely (although leaving the confines of the vapors will expose them to the surface atmosphere, which suffocates them).

Bewilderingly, ordinary table salt destroys the hardened fogwall edges.  Sprinkling salt where the vapor touches the ground disrupts the wall's integrity, making it permeable to person and vehicle alike.

In the Mutant Future, many cities would pay handsomely for their own personal protective fogwall generator...though that'd make them vulnerable to incursions by slime people....