Where the gnolls come from, only the gods of this world know. Their existence as a whole is unknown but to a minuscule proportion of the humanoid population. Gnolls do appear in goblin tales all over the world, but few humanoids have ever interacted with goblins for long enough to know about the tales they tell their children to scare them (and to turn them away from a life of order).
Basic Information
Anatomy & Physiology
Gnolls are bipedal, although their gait differs markedly from that of other humanoids, thanks to their double-jointed legs of a hyena. This is not the only trait they take from hyenas. They also have impressively powerful muzzles, a tail, and some have shaggy manes.
Gnolls tend to be extremely muscular, although it is hard to say whether this is inherent to their physiology or due to the life of hardships they face. Those who are not fit will often end up as the lighthouse keepers, where a life away from the clan and subject to the everpresent terrorific presence of the sea will wear most gnolls down in just a few years.
Lighthouse keepers are gnolls who are in charge of an essential task: to prevent any outsiders from reaching the dungeon.
They use their ill-named lighthouses to confuse seafarers and most often, smash their boats into the craggy coastline. Sometimes, when the clan needs new slaves, they do guide ships to safety, only to be meat by a band of lighthouse keepers and rovers who enslave the humans under their command.
A gnoll lives for an average of 30 years, although the end of their lives is accelerated, given the roles given to those unable to hunt or protect the dungeon. Gnolls with a special status in the clan, who are not relegated to the coastline, may live for up to 60 years old.
Reproduction

by Maria Gatta (Hero Forge)
Female gnolls become reproductive between the ages of 6 and 10, depending on whether their childhood years were lean or abundant. When a female teenager becomes receptive for their first time, she is send away by the matriarch, to face a period of isolation and survival in the wild. If she survives, she is welcomed back into her clan, and the next time she is sexually receptive, she may choose as many males as she wants to mate with.
A pregnant gnoll is revered, as the clan's survival depends on them. During their pregnancy, gnolls are afforded the opportunity to change their task the matriarch appointed to them during their teenage years. They can choose how they think they can help best the clan. Although not often, sometimes a pregnant gnoll shines in her new role, and she is allowed to change professions after she delivers her litter.
Their pregnancy lasts for about 8 months, after which their life returns to normal, caring for her litter while also caring for whatever her usual duty is. Some pregnant gnolls, however, experience an awakening during their deliveries (often signalled by many of their litter dying during the delivery itself these gnolls invariably join the clergy in one way or another.
Godly Connections
Gnolls are innately connected to the gods of this world, even if few of them understand them. Most don't even bother to. Their ancestors provide enough guidance to last a lifetime. However, several gnolls, usually female, per generation will be touched directly by the gods, to continue their ancestral pact of protecting their home island, and making sure nothing escapes from it.
These gnolls touched by god are revered and feared at the same time. They usually have a prominent space in society, and when one of them argues for a specific, often unsound path, few dare to oppose, as their insight is seen as divine.
Beyond a divine order to contain the islands inhabitants to this place, the gods also altered the gnolls in a significant way: they made them utterly terrified of water. The gods also did this with goblins, except, where gnolls tend towards lawfulness and order, goblins tends towards chaos.
Thus, while gnolls have never tried to purposefully set a foot outside of the island, goblins engineer plans to "defeat" the water and get out of the island over and over again.
Hey for some reason the like button is not working. Perhaps some bb code left open?
Hey, thanks for letting me know! There were indeed some pesky unclosed bbcode tags. It should be fixed now :D
Yes seems to be in order now! ^^