Well because its not warhammer i'll give a stab at some fluff and rules
WARPWOLFShiborganheim was a normal town with normal people until one Gehemisnacht. The chaos moon Morrslieb waxed full and green glowing metors rain down upon the town. They rained down destroying homes and the villagers inside until no stood. Some hid in cellars fearing an unnatural storm at work but if examined today you would find naught but mysteriously locked cellar doors and nawed bones...
However there were survivors. 2, a boy and his dog. But the metorites that rained down that night were not of natural materials. The chaos moon Morrslieb was made of otherworldy matter: warpstone. Warpstone has an effect to mutat. Man losing his sanity and becoming beast. Beast rearing up on its hide legs and poardying man. That is what happened on that fateful night.
The young boys name has passed into educated guesses but has now been replaced. They were trapped in the wreakedge of their village and refused to consume one another, they were forced to eat chunks of the meteors. They devoled into abominations intent on leting them selves survive even if it meant killing their companion...
One day, the boy gave into his cravings for meat. Delicious warm meat. He could stand it no more and lunged at his dog.He could tell that the dog had the same idea in mind for at he same time it turn and snarled then pounched. the dog teeteh bit deep into the boys flesh. Then the weird things started to happen the boy no longer had any control over his muscles and the dog's jaws loosened. Then things got weirder the dog lost his forn and became a sloppy jelly like substance. It wrapped itself around the boy and he began to mutate. He retatied hes human like posture but had the body of a dog. Then began his campaign of terror...
After that the beast has become a figure of awe. Having at least a bounty of 2000 in all of the civilized provinces in the old word he is responsibe for atleast 12 imperial general deaths, And the destruction of an entire town. Posing as a beggar in town until Morrsleib waxes full he transforms into a monster wishing to kill and eat everyone in sight. so is it that a young boy has been plauged with the curse of the warpwolf for decades and problebly centuries doomed to exist as a monster until his doom is met snarl and claw...
M WS BS S T W I A LD
the warpwolf is a hero choice in a beastmen or warriors of chaos army
6 6 0 6 5 4 7 6 8
Iron hard Claws of rending: The warpwolf uses his claws in close combat. These attacks are armor percing and each wound in mutliplied into two wounds.
The Beasts Howl: One per shooting phase the warpwolf may make a special attack, even if it is in combat it affects all units (freind or foe)within 6 in or the unit he is in close combat with. All units affected must take a panic test and each model in the unit suffer strength 3 hit with no armor saves allowed. If the unit is in combat it is treated as having failed its break test and the warpwolf may choose to pursue. Please note that the panic test and and failed break test only affect the unit and do not spread like normal rules for panic.
Master of the Pack: The warpwolf may never be your armies gereral unless under certain circonstances (see below). If the warpwolf is included in your army then chaos warhounds will count towards your mininuin number of core troops. As stated above the warpwolf may never be the general of your army unless in consists entirly of warhounds, harpies, razorgor herds (not chariots) or anything from Warhammer Armies: beastmen in the rare section or dragon ogres chaos trolls, shaggoths or chaos giants. Wheter or not he is your army's general he may never join units.
Mangy Hide: The warpwolf has an armor save of 4+ from his hide. But no armor save may be tacken.
So what do ya think