"M" is for "Mamalegs"

Mamalegs

No. Enc.:  1 (1d6)
Alignment:  Neutral
Movement:  120' (40')
Armor Class:  5
Hit Dice:  6
Attacks:  1 (bite)
Damage:  1d10 + poison
Save:  L6
Morale:  8
Hoard Class:  IX, XIV
XP:  2,070

"Don't be the child that bullies, don't be the child that begs, don't be the child that lies and steals...or you'll meet ol' Mamalegs."  —  Mutant Future rhyme

As horrifying as giant, sentient, psionic arachnids are to the average denizen of the Mutant Future, the beasts known as mamalegs are particularly terrifying...because they steal children in the night to rear as their own.  A mamalegs can detect the brainwaves of pre-pubescent Pure Humans and Mutant Humans of distances up to 3 miles, and they are particularly drawn to the "unhappy" and/or "ill-behaved".  A mamalegs believes it is better suited to nurture, heal, and discipline such wayward souls than their obviously unfit parents, so it creeps into a residence (Surprising on a roll of 1-4 on 1d6), tranquilizes the occupants (with its Class 12 narcotic venom), and absconds with a child or two in its 4-pronged mandibles.

No one knows what happens to those taken by the mamalegs.  Some suggest the children are transformed into arachno-beings themselves, while others believe they are eaten alive.  Others say that there are entire subterranean cities—complete with schools, playgrounds, and medical facilities—full of the she-spiders and their humanoid charges. 

Covered in prickly fur, mamalegs have low-slung bodies that reach 4'-6' long, but their limbs can reach heights of 13'-15' or more.  They are highly sensitive to light, and suffer a -3 To Hit penalty in daylight combat, and -2 To Hit in well-lit interiors.

Mutations:  Empathy, Mental Phantasm, Night Vision, Toxic Weapon (Venom), Unique Sense ("Inno-Sense"), Vision Impairment (Light Sensitivity) [D]