Xill (GEP)

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Vaguely reptilian natives of the Ethereal Plane, xill are fourarmed, brilliantly red-skinned humanoids feared on all planes that border the Deep. 'Course, some xiii (those among the High Clans) claim that such fears are unfounded, but peery bloods believe that even the so-called civilized xill harbor a dark secret. Since they only communicate telepathically, it'd be particularly easy to hide a secret from most others.
Lower Clan xill rarely use weapons, preferring the strength of their claws, and they never create anything of their own, including domiciles on the Ethereal. They seemingly live only to reproduce, and thus raid other planes looking for intelligent hosts for their eggs (all xill can move between the Border and adjoining planes at will).
High Clan xill craft tools, weapons, and clothing, and live in free-floating cities built upon and from stable ether plus material stolen from other planes. The High Clans rarely leave the Ethereal, but if they're encountered by planewalkers, High Clan xill may trade goods and information with travelers to the Misty Shore. However, High Clan xill still need to use intelligent creatures as hosts in which to hatch their young. Rumors speak of a vast hatchery/nursery hidden somewhere in the Deep where human slaves are bred and grown like cattle to serve as hosts for xill eggs.
Victims of a xill's paralyzing attack can expect a quick trip to the Deep. Once the xill reaches its lair, it implants its paralyzed victim with eggs. The eggs gestate four days before hatching (during which time a cure disease spell removes the infestation), after which the larvae begin to eat their way out of the host. This horrible process takes another seven days (at this point, only a wish or limited wish can save the victim); the host suffers 1d10+10 points of damage each day the xill larvae eat. Eventually, 2d8 young xill emerge from the victim, killing him instantly if he's not in the dead-book already. (PLANESCAPE MONSTROUS COMPENDIUM Appendix III)
Xill: AC {O}; MV {15}; HD 5; THAC0 15, 13 with missiles; #AT 4; Dmg 1d4x4 (claw x4) or by weapon; SA Surprise, paralyzation, rare High Clan xill can be 5th-level clerics; SD Etherealness; MR 70%; SZ M (4-5' tall); ML elite (15); Int very (11-12); AL LE; XP 3,000.
SA-Surprise: Xill attack by slipping across the Border, startling intended victims (roll for surprise at -6). The invading xill attempt first to subdue their foes, using two arms to grapple and two to punch. Paralyzation: If two of the xill's claws successfully strike a foe (inflicting 1 d4 points of damage each), the xill holds on and automatically bites the victim the following round. The bite inflicts no damage but forces the victim to make a saving throw versus poison or face paralyzation for 1d4 hours. (The xiii produces enough venom for only two bites every six hours, and it can't bite a foe that it hasn't grappled.)
SD-Etherealness: The process of going ethereal with a victim takes 2 rounds, during which time the xill is completely immobile and forgoes its magic resistance. However, as the xiii fades, it becomes harder and harder to strike (AC -1 in the first round of planar transfer and AC -3 in the second)