Clan Verminus
Clan Verminus is a type of Clan unique to Age of Sigmar. As the Clans in AoS is instead a type of Clan (So a plague-infested monk Clan will be a Pestilens clan among many), the "Clan Verminus" is essentially the old Warlord Clans. They're all Skavenslaves, Clanrats, Stormvermin and Warlords; none of the fancy shit. Then again, if you can't win by throwing thousands upon thousands of warm, ratty bodies at the enemy, how can you say you're playing Skaven?
