The skaven were born in the sewers and raised to play blood bowl. Here they play on the infamous home court known as the Cage. The skaven disliked this field and yearned for greener pastures and fancy stadiums like the ones seen topside. They vented their frustration to try to get a new stadium built topside but in the end they were stuck and confided to their stadium. So they joined the Blood Bowl league to finally be able to play on nicer stadiums. However they have to live with the fact that despite all their rage they’re still just skaves in The Cage.