It's not restricted by skills, only teams. So basically its Humans, Amazons, Vampires, all Elves, Goblins, Skaven and Ogres, if I recall correctly. Which means that the concept "No Bash" is proving remarkably inaccurate, as with so many low AV teams its even more brutal than it otherwise would be. Especially as plenty of people have taken to building some lethal Amazon and Human killer teams - with good Strength skill access and fast blitzers they really can clean up. In fact its a league that makes Humans pretty awesome. Human or Amazon Blitzer with Tackle, Mighty Blow and Piling On are pretty much king/queen of the heap.