Gnolls According to legend, the Gnolls once lived in a great empire alongside many other peoples. And if one looks at the broken monuments and abandoned cities being claimed by the wasteland they now inhabit, that legend seems plausible. Generations ago, the demon lord Yeenoghu started a cult among the Gnolls and gave them power over death in exchange for three simple commands: Make nothing but weapons; Pay nothing but blood; and Leave nothing but ash.
The cult of Yeenoghu wrote no books, raised no monuments, and worked no land, but with their power and fanaticism were able to take what they wanted from those more civilized than themselves and tear down the walls of those who tried to keep what they had produced. The irrigation works that had taken hundreds of years to produce were destroyed in just a few years. The cult went out of its way to butcher those they had robbed, but took special care to murder those Gnolls who had not joined.
Today, almost all of the Gnolls are members of the cult of Yeenoghu. Though they remain physically dangerous, their numbers have dwindled, and the ghoul haunted wastelands they now prowl have little in the way of people or wealth. The Gnolls keep their pledge to make nothing but weapons, and make their living as hunters, scavengers, mercenaries, and bandits. Their herds of ibixes and aurochs are no more, but the Gnolls still have their hyenas and hyenadons, which they regard similarly to how a Human views a Sphinx or a Dwarf views a Shedu: an attractive head on the body of a strange beast.
Gnolls look very much like large humanoid hyenas. As with that species, the females are slightly larger than the males but quite difficult to tell apart. Gnolls are omnivorous, but can live on an entirely meat-based diet and prefer to do so. The most prestigious clan of Gnolls is called the Flind, and their members are larger and often have identifiable demonic traits from their mixed ancestry.
The priests of Yeenoghu command ghouls, and bands of Gnolls often work alongside Trolls. However reluctantly, most Gnolls will now consent to buy things with copper or silver rather than simply taking whatever they want, though only in areas which have temporal authorities that can't be easily overwhelmed. Gnollish mercenaries appear in armies and hordes thousands of kilometers from what were once considered the Gnollish lands.
The weaponsmithing of the Gnolls is actually quite advanced. While most Gnolls know nothing of their history and the libraries they once frequented have long since been cleansed by fire and rain, Gnollish blacksmiths have handed down techniques through the ages in an unbroken chain of master and apprentice from before the time of Yeenoghu. They have a method of making folded and rolled steel using charcoal pits that can be performed even in the wilderness. Gnolls make some of the strongest wire and chains, and make a number of chain based weapons.
Link:
http://www.tgdmb.com/viewtopic.php?p=402516#402516 
