Ok, I know this seems like a joke, but really, it's not. I'd created this creature back in middle school when I always wondered what subterranean creatures ate. Yes, I know about Rothe, but an herbivore just doesn't seem right, especially not one based on such a massive(and inefficient) creature as a cow. So, without further delay
Climate/Terrain: Any Subterranean
Activity Cycle: Any
No. Appearing: 1-12
Armor Class: 7
Hit Dice: 2+2
No. of Attacks: 1
Special Attacks: Poison(Type A)
Special Defenses: Immune to ingested toxins
Magic Resistance: Nil
Size: M(6' diameter)
XP Value: 270
The Spiderpig looks to be a cross between a wild boar and a huge spider. The creature has a pink spider shaped body, with a boar's head and leathery skin. Unlike a normal spider, the Spider pig has an internal skeleton, allowing the goblins or whatever other creature keeping them to fatten them up for slaughter.
Combat: Spiderpigs have a temperament similar to that of a normal, domesticated pig; which is a pretty nasty disposition. Spiderpigs attack with their bites, injecting poison into living prey. Creatures bitten by Spiderpigs get a +2 bonus to their saves to resist the poison.
Habitat/Society: Spiderpigs are usually kept by goblins for food, leather, and poison. Spiderpigs are allowed to roam the warren. Goblins boil down the venom, allowing it to become full strength type A poison. Boar Spiderpigs will fight without stopping until they hit -5 hp.
Ecology: Spiderpigs root through the Goblin warren filth in search of organic matter, be it baby goblin, vermin, carrion, or the odd fungus. Spiderpigs lay egg sacs in piles of dung, where the gestate for 2 months before a swarm of 10-100 young spiderpigs hatch. The ensuing fratricidal feeding frenzy, resulting in a new herd. Lone spiderpigs are always boars in search of Sows. Normally a typical Goblin warren will only keep 1 boar at any given time, if it keeps one at all.