#bebilith

So, Bebilith are not tanar'ri. Actually, they are something more ancient and harmonized than them. They are one of the last notable remnant of the original Chaotic Evil plane before tanar'ris infected reality like a cancer. Those original demons were supposed to represent a Chaotic Evil that had its place in the Great Wheel, an Evil that happened to be Chaotic too, about self-interest, liberation from the constraint of the worlds, freedom of mind beyond morality and ethics, something not entirely unlike Nietzschianism ; not nice, by all means, but an incarnation of CE you can live with, even discuss with, rather than the brutal and destructive "MUHUHAHA, I WILL DESTROY YOUR WORLD, KILL YOUR FAMILY AND EAT YOUR HENS ! " of the tanar'ris.

In this original cosmology, the bebilith were an exemplary demons, there to teach by the example and natural selection the first lesson of CE : Don't let yourself get bound by the rest of the world. They attacked their unwilling students by their webs and those unable, unwilling to escape them were deemed unfit for illumination and killed by venom. Those who escaped, those who had shown a will and a capacity to not be ensnared by even incarnates of the universe, were given a second lesson and freed from their armour, asking them if they were ready to suffer true freedom and not be protected by the constructs of society. If they still defied the bebilith, they were left unmolested and telepathically contacted for more verbal lessons and explanation of what was they made to endure... Nowadays, well, they continue to make the world free. Free from tanar'ris. Free from destruction, entropy and oblivion, free to embrace a sophisticated nihilism that lives among the world, not against it. They will scrub and dissolve all trace of this infection from their beloved Abyss even if it takes several eternities to do so, and they won't let them escape and mushroom on another plane, tracking, hunting and devouring heartlessly the few tanar'ris that managed to escape their prison. This lesson is not for them. 

A take on bebilith, the giant demonic spiders that other demons fear from thread  page 31 of  [Let's Read] D&D3.5 Monster Manual (by someone with no idea of what he is doing) Thread on Rpg.net by Monsieur Meuble 

But still, a few things make the bebilith a bit unique. First, it has an Armour Rending attacks, destroying the artificial armours of anyone it lands two Claws attack on, because your Fighter was getting too cocky and thought he would amount to anything this time for having managed to cut through the webs. Secondly, it's a clever demon (INT11) that understand Abyssal and can discuss through telepathy and has the motivation of passionately hunting and eating other demons. It even has some social skills, so even lost in the middle of the Abyss, you can try to get pal with them, "don't eat me bro, together we can bring down a whole nalfeshnie for dinner ! ". This aspect was more stressed upon in previous editions and notably Planescape, from what I have read in the Let's Read, making them The Thing That Even Demons Fear, the symbol of inescapable death and entropy for tanar'ri and the reason why retrievers look like that. Thirdly, they are Huge. That's rather big. The body of the bebilith is as big as a horse, with the legs it occupies a 4m-wide circle. A freakin' balor looking at a bebilith will think "Oh my Demon Prince, this spider is bigger than me and wants to eat me ! ". This rather helps to underlined the previous point, I think... Fourthly, it can Plane Shift supposedly at will. So, you now have an excuse for why there's a random demon in your non-planar dungeon. This also means that this thing will pursue demons all across the Great Wheel if need be, leading to either the PCs being recruited by a demon that is pursued by a bebilith that is coming for him any minutes now (and it's fun when you can make a glabrezu sweat about giving a Wish no holds barred...) or inversely, to the PCs being contacted by a bebilith that is the first and only person to know of the intrusion of Scoundrelux The Evil Demon on the Prime plane and it wants to find it since it swore to turn it into soup (”also Scoundrelux wants to destroy reality or something, might interest you”).

There were hints in lore they inspired in-universe the constructs known as retrivers, which  Demon lords use to seek out those who dare abandon their loyalties or flee from servitude.

According to the Planescape Monstrous Compendium, Bebiliths have "an uncanny mystique" among the demons of the Abyss to whom harming a Bebilith is taboo (which must make life awkward since Bebiliths hunt and eat demons). It says Bebiliths are viewed as the "punishers" of tanar'ri and occasionally exterminate entire species of demon for unknown reasons. That MC's flavour text intro is about an alchemist who went to the Abyss and cut three spinnerets off a Bebilith to make a magic net, but when a friend went to visit him in the Prime Material the entire city the alchemist's home was in was lain waste - maybe another example of "punishment".

from RPG.net user JRM from  the thread[Let's Read] AD&D 2e Monstrous Compendium Fiend Folio Appendix started by Leonaru

Planescape Monstrous Compendium Appendix II (1995):

It’s thought that Demogorgon was the first tanar’ri [to make a Retriver], modeling the retriever’s design on the form of the bebilith, or “creeper of the Abyss.”

Monster Force

Bunch of 3D-printable monster miniature sculpts I did for Rocket Pig Games.

Bebilith Swarm by ProdigyDuck

In Dungeons & Dragons, the bebilith is a spider-like demon said to hunt the Abyss, a dark and chaotic universe. The size of a large horse, the bebilith has razor sharp claws which it uses to rend armour apart. It also has a necrotic bite.

Bebiliths are said to be incredibly aggressive, and will attack any creatures they come across.

Image source.

Monster master list.

BEBILITH

LEVEL: 27 (out of 35 possible)

TYPE: Fiend

SIZE: Huge  

ENVIRONMENT: Underdark & Underground (Abyss)

SPECIAL POWERS and ABILITIES:

- Wicked Poison (The poison of a bebilith is very powerful and turns the victim into an fiend, a demonic version of its former self, Bebilith only like to eat demonic flesh, so the poison helps with this.)

- Pain Webs (The webs a Bebilith creates cause horrid pain it its victims, they can keep their screams in so they form their own alarm system for the Bebilith so it knows it caught something.)

- Demon Slayer (A Bebilith loves demon and fiend flesh, in battle against demons or fiends they gain the berserk status.)

- Impaling Legs (The legs of a Bebilith are like spears, impaling anything on it.)

CHANGES FROM REAL D&D CREATURE I MADE: They are among my favorite D&D monsters so not a lot of change spare for their new magical webs and poison to make them even cooler for myself.