In times long ago, Clan Moulder experimented with combining their Skaven blood with that of the great wolves of Kislev. The result was a bloodthirsty monster of such foul temperament that the Master Moulders could hardly contain it, much less train it for war. They managed to wipe out nearly all of the creatures, but despite their best efforts, a few escaped into the tunnels of the Under-Empire. In the intervening years, some escaped altogether, but a few remained behind to hunt their Skaven creators.[1a]