Orignally known as Rat Rock, it was inhabited by by several competing Warlord Clans and the home of thousands of the skaven and their slaves. [1a]
However they were assailed by an unknown enemy who had command over the mist themselves and were described as cyclopean swamp-dwellers. Although the Warlords united against the common enemy they were wiped out, but are said to have killed their attackers as well. [1a]
The description makes it certain that the unknown enemy were the Fimir.