Skaven

Skaven are a malevolent race of humanoid rats that reside in the fictional world of Warhammer Fantasy, they are an enemy of the human race and seek to destroy them via manipulation, plague and conquest - almost all Skaven are worshippers of the sinister chaos-god known as the Horned Rat and even their own kind are not safe from their evil intentions as Skaven society is ruthless and cut-throat, with only the sneakiest and most despicable of individuals making it to adulthood - although similiar to the Beast-Men the Skaven have always been classified as a unique threat in their own right and their exact origins have been debated for centuries by many scholars: although a popular theory holds that the Skaven are a result of a monstrous mutation in common rats caused by Warp Stones, a strange and powerful source of power which many Skaven still seek almost obsessively.

Skaven are an army that lack much in the way of war-machines and rely mainly on their sheer numbers, although their twisted minds have concieved some notable weapons of war such as the Screaming Bells and the Doomwheel - being a clan-based society Skaven rarely march to war under a single leader and tend to be loyal only to those who are strong or vicious enough to keep them from rebelling.

The paranoia, hate and greed most Skaven possess is perhaps the only true weakness these rodents have and it is believed by many that if they could put aside their own differences and truly unite then the Skaven could effectively take over the world - thankfully for humanity there seems to be little chance of that occuring as the Skaven are stubborn in their ways and continue their in-fighting when not plotting the demise of the other races in the world.

Allies
Skaven hold no allies, even amongst themselves, and no sane army would be caught dead with Skaven in their midst - even the Hordes Of Chaos will not ally with Skaven and for this reason they are one of the few races that are almost never sen in alliance with anyone else on the battlefield: although universally hated the Skaven are especially despised by the Dwarves - who wage continual wars with them - and Lizardmen, who often feed Skaven as offerings to their gods.