BOGGLE

Boggles are 3-foot tall, vaguely humanoid creatures whose coloration varies from blackish-blue to dark gray. They all have large bulbous heads, but the rest of their body parts are disproportionate and vary from individual to individual (large noses, arms of different lengths, spindly legs, and so forth).

The social organization of boggles is loosely tribal. They tend to whine and gibber a lot when dealing with other creatures. Outside their lair, boggles are somewhat cowardly, and they all tend to be thieves. However, when found in their lair, boggles are aggressive and voracious.

Boggles secrete a viscous, nonflammable, black oil from pores in their bodies. Anyone treading on the oil (except creatures specially adapted, like boggles, for climbing on slick surfaces) must roll their Dexterity or lower on 1d20 or fall down. Characters who fall must spend an entire round standing back up. 

Boggles will try to steal articles from a character who has fallen. They must make a successful roll vs. armor class 5 to steal any one item from a fallen or stunned character.

Boggles have a rubbery hide and their bodies are partially elastic. They may stretch to twice their length or contract to one-half their size. Because they have slippery and resilient hides, all weapon attacks on boggles will cause -1 point per die of damage. 

Boggles naturally resist fire (as the ring) and can spider climb at will. 

They like to cling to ceilings in order to drop upon unwary characters and get an additional 2 claw attacks (as do cats.)

Boggles have the special ability to dimension door at will for up to 3" through any complete frame, such as a hole, a door frame, grillwork, between a character's legs, and so forth. They can reach through a hole and their hands will come out elsewhere. This enables them to grab or strike at a character from another side. 

Boggle lairs are often pocked with holes or appear as grillwork. Their main nest is accessible only by dimension door or other magical means.

Finally, boggles have an exceptionally keen sense of smell and can even detect invisible creatures by smell. 

Other races are known to utilize boggles as guards and watchers because of this ability. When boggles sense intruders they set up a high-pitched keening wail to warn their masters.